In the summer of 634, Arab-Muslim forces, probably commanded by Khalid ibn al-Walid, met a Byzantine army led by Emperor Heraclius’s brother Theodore — and possibly the Armenian commander Vardan — at Ajnadayn, in Wadi al-Samt between Ramla and Bayt Jibrin.
Walter Kaegi calls 30 July 634 the probable date rather than a certain one; other reconstructions give July or August 634, and some traditions place the battle in early 635.
The Muslims won an open-field battle and inflicted a serious defeat: one Byzantine commander, possibly Vardan, was killed, while Theodore escaped.
The 90,000 is not a count
The listing’s figure of 90,000 Byzantines is not a credible modern estimate.
Traditional sources supply enormous and mutually inconsistent army and casualty figures, and the consulted scholarly account does not endorse that total.
No Byzantine source explicitly names Ajnadayn either — Byzantine accounts may conflate it with Dathin or Yarmuk — so the detailed narrative depends heavily on later Arabic traditions.
Walls became the frontier
The defeated Byzantine units scattered into fortified Syrian and Palestinian cities and temporarily lost their coherence, which gave Muslim forces freedom to overrun much of the countryside and disrupt communications between towns.
After learning the result, Heraclius left his Syrian base at Hims for Antioch.
The road between Jerusalem and Bethlehem became unsafe enough that Jerusalem’s patriarch discussed the obstruction in his Christmas sermon.
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Traditional date. Conventionally dated here; the research places it at ~0634-07-30.
What the sources leave uncertain
Walter Kaegi calls 30 July 634 the probable date, not an independently certain day. Other reconstructions give July or August 634, and some traditions place the battle in early 635.
No Byzantine source explicitly names Ajnadayn; Byzantine accounts may conflate it with Dathin or Yarmuk. The detailed narrative depends heavily on later Arabic traditions.
A 2019 revisionist study argues that Arabic accounts confused Ajnadayn with Yarmuk and places Ajnadayn later. This has not displaced the conventional 634 reconstruction but demonstrates that the chronology remains contested.
The chain of command is uncertain: Theodore and Vardan may have shared command, while Arabic traditions disagree whether Khalid or Amr held overall Muslim command.
In 634 Heraclius stood near the summit of his prestige — he had beaten Persia and restored the True Cross to Jerusalem — yet a new enemy was already breaking his southern defenses.
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Through 634 and the two years that followed, Heraclius was in the eastern provinces organizing the defense of Syria. Walter Kaegi's study of Byzantium and the early Islamic conquests explicitly rejects the claim that illness had decisively incapacitated him.
Nor was he a discredited ruler. He had defeated Persia and was near the height of his prestige, and Kaegi finds him energetic during the 630s.
Later narratives invoke the emperor's illness to explain Byzantine defeats; Kaegi treats that as an exculpatory tradition.
The field army sent to Ajnadayn
Muslim successes in southern Palestine had already broken the first Byzantine defenses. Byzantine authorities responded by assembling a larger field army.
Heraclius's brother Theodore commanded it, possibly alongside the Armenian patrician Vardan. It was defeated at Ajnadayn, on the probable date of July 634.
Theodore escaped the defeat and subsequently fell from favor; Vardan was probably killed there.
From Hims to Antioch
Heraclius had been using Hims — Emesa — as his Syrian military base. After Ajnadayn disrupted the Byzantine position in southern Syria, he moved to Antioch and Byzantine defense shifted toward fortified towns.
The communal picture is less tidy than the old story of populations welcoming the invaders. Kaegi finds the evidence that Monophysite hostility caused Byzantine failure tenuous.
No source identifies any specific action by the Jewish communities near the later Yarmuk battlefield.
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Date disputed. Sources disagree; the research places it at ~0634.
What the sources leave uncertain
The listed item is not one datable event but a bundle of military, medical, religious, and communal claims assigned to the year 634.
Later narratives invoke Heraclius's illness to explain Byzantine defeats, but Kaegi treats this as an exculpatory tradition and finds him energetic during the 630s.
Sources do not permit a single description of how all Miaphysite Christians or all Jews in Syria reacted to the conquerors.
The terms “Monophysite” and “Eastern Orthodox Church” flatten a complex seventh-century dispute among Chalcedonians, Miaphysites, Monoenergists, and later Monothelites.
In 637 Muslim troops under Sa'd ibn Abi Waqqas captured the Sasanian capital complex at Ctesiphon. Yazdegerd III, the royal family, nobles and surviving troops fled.
The conquerors seized the royal treasury and the famous royal garden carpet.
The opening had come at al-Qadisiyya, where Sa'd's army defeated the main Sasanian field army under Rostam. That battle's year is disputed — 636 or 637 in the conventional reconstruction, and a revisionist numismatic chronology proposes 634 or 635.
The sawad taken, the chronology unsettled
By the probable battle of Jalula in late 637, Muslim forces had completed the conquest of the Babylonian sawad, the irrigated heartland of central Iraq. Persian resistance continued farther east.
The traditional chronologies for al-Qadisiyya, Ctesiphon and Jalula do not fit together consistently, so their sequence within 637 will not carry day-level precision.
Accounts of Jalula give contradictory dates, commanders, force sizes and casualty totals; only a battle after Ctesiphon and before Nehavand can be treated as secure.
What did not change
There was no event in 637 in which Islam replaced Zoroastrianism. Conversion of Iranian populations to Islam was gradual and limited through the end of the Umayyad period, accelerating after 750.
The new rulers initially retained extensive Sasanian administrative continuity. Persian remained an official language of business in the eastern caliphate, and tradition dates the Arabization of Iraq's fiscal registers to around 697 — six decades after the conquest.
Mesopotamia had been religiously diverse before the conquest; it was not an exclusively Zoroastrian society.
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Date disputed. Sources disagree; the research places it at ~0637.
What the sources leave uncertain
There was no identifiable event in 637 in which Islam “replaced” Zoroastrianism. That wording confuses military conquest with a demographic transformation extending over centuries.
The date of al-Qadisiyya is highly disputed: sources and scholars place it in 636 or 637, while a revisionist numismatic chronology proposes 634 or 635.
Traditional chronologies for al-Qadisiyya, Ctesiphon, and Jalula do not fit together consistently. Their exact sequence within 637 should not be presented with day-level precision.
Accounts of Jalula contain contradictory dates, commanders, force sizes, and casualty totals; only a battle after Ctesiphon and before Nehavand can be treated as secure.
The date fixed to Alexandria's fall in 641 belongs to a negotiation, and it happened somewhere else. Cyrus, the Chalcedonian patriarch of Alexandria and imperial civil governor of Egypt, travelled to Babylon in Egypt to meet the Arab-Muslim commander Amr ibn al-As.
The two concluded a capitulation agreement fixing tribute and an eleven-month armistice. Muslim forces were to remain apart from Alexandria while the Byzantine garrison evacuated by sea with its possessions.
The precise date of 8 November is itself a scholarly reconstruction, associated especially with A. J. Butler, rather than a date stated by the chronicler John of Nikiu; some accounts give October, or simply late 641.
Two hundred hostages
Byzantine forces were to end hostilities and not return. Muslim forces were to refrain from seizing churches or interfering in Christian affairs, and Alexandria's Jews could remain in the city.
Performance was guaranteed by people: 150 soldiers and 50 civilians held as hostages.
The terms survive principally through John of Nikiu, a later seventh-century Egyptian bishop whose chronicle reaches us only in an Ethiopic version made from an Arabic intermediary.
September 642, when the city changed hands
The city was not physically handed over on the day of the treaty. Theodore and the Byzantine troops evacuated in September 642, after which Amr entered Alexandria without a battle.
Sources give 17 or 29 September 642 for that moment; the difference may distinguish the garrison's departure from the Muslim occupation.
The result was not yet permanent either — a Byzantine expedition retook Alexandria in 645, and Amr captured it again in 646.
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Traditional date. This date is the conventional one, not one fixed by a contemporary record.
What the sources leave uncertain
The exact date 8 November 641 is a scholarly reconstruction, especially associated with A. J. Butler, rather than a date stated directly by John of Nikiu. Some accounts give October or simply late 641.
Sources differ between 17 and 29 September 642 for the final evacuation and Amr's entry. The difference may distinguish the garrison's departure from the Muslim occupation.
The surviving Chronicle of John of Nikiu is not the original text; it survives through an Ethiopic version made from an Arabic intermediary, complicating exact readings.
Calling the preceding operations a continuous six-month siege is questionable. John describes fighting and pressure around Alexandria, but Amr also left a detachment and operated elsewhere.
The attack came from inside the tightly arranged rows of Medina's morning prayer — and by al-Bukhari's account the assailant stabbed thirteen people on his way through.
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During morning prayer in Medina in 644, Abu Lu'lu'a attacked Caliph Umar with a double-edged knife. A report preserved in Sahih al-Bukhari says he stabbed 13 people, seven of them fatally.
Abu Lu'lu'a was a Persian slave and skilled craftsman owned by al-Mughira ibn Shu'ba. The sources disagree about his religion, his motive, the exact manner of the attack and his death.
Medieval accounts commonly connect the attack to a disputed tax imposed by his owner, but they give incompatible versions and the motive is not securely known.
Which day, and how long he lived
Umar died in Medina of his wounds. Wilferd Madelung's chronology equates 26 Dhu al-Hijjah 23 AH with 3 November 644; Encyclopaedia Iranica converts the same date to 2 November.
The narrative sources also split on whether he died during the attack or survived three days.
Iranica judges the three-day version the more probable of the two.
Six names, then two
While mortally wounded, Umar identified six eligible successors: Uthman, Ali, Talha, al-Zubayr, Abd al-Rahman ibn Awf and Sa'd ibn Abi Waqqas. He did not simply nominate Uthman.
The six met after his burial. Abd al-Rahman withdrew his own candidacy, reduced the choice to Ali and Uthman, and finally gave Uthman the first pledge of allegiance; Ali and the Medinans followed.
Umar's son Ubayd Allah meanwhile carried out retaliatory killings of people he suspected of involvement — an immediate controversy inherited by the new regime.
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Date disputed. Sources disagree; the research places it at ~0644-11-03.
What the sources leave uncertain
Madelung gives 26 Dhu al-Hijjah 23 AH as 3 November 644; Encyclopaedia Iranica converts it to 2 November.
The narrative sources disagree over whether Umar died during the attack or survived three days. They also disagree over the number of blows, Abu Lu'lu'a's religion, motive and fate.
The designation of the six-man council is well attested in Islamic tradition, but some modern scholars have questioned parts of the received election narrative.
The date filed as a conquest may mark a retreat: Chinese records read by H. A. R. Gibb say Tokharistan's forces restored a Sasanian prince once the Arabs pulled back.
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No reliable scholarly chronology identifies 655 as the year Arab armies conquered both Khurasan and Transoxiana. Encyclopaedia Iranica dates the principal seizure of Nishapur and other Khurasani cities to 651–653, and stresses that the chronology varies.
H. A. R. Gibb's reconstruction from Chinese records instead places an Arab retreat in 655, after which forces from Tokharistan restored Yazdegerd III's son Peroz as a titular Persian king.
That specific date rests on Gibb's interpretation of those records; other accounts distribute the retreat, the revolts and the Arab counterattacks across 653–658.
Thin garrisons, repeated revolt
Abd Allah ibn Amir had withdrawn most of his army after imposing tribute. A reported 4,000 men were left to hold Merv.
Local forces then withheld tribute, expelled Muslims from Nishapur and recovered Balkh. Abd Allah ibn Khazim suppressed Qarin's revolt in 653–654, but Muslim control remained thin.
One modern scholarly summary describes the pattern as capture, rebellion and recapture.
Transoxiana, decades later
Reaching the Oxus or raiding Tokharistan was not the same as conquering Transoxiana, and that conquest was not completed in 655. The first traditionally dated Arab appearance at Bukhara was in 673–674.
Permanent Arab control there was achieved only during Qutayba ibn Muslim's campaigns of 706–709.
In the nearer term Arab authority collapsed across much of Khurasan during the First Fitna of 656–661.
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Date disputed. Sources disagree about when this happened.
What the sources leave uncertain
The eastern-conquest narratives contain duplicate campaigns, divergent Islamic-era dates and later tribal traditions; Encyclopaedia Iranica explicitly says the chronology varies.
Gibb's specific 655 retreat relies on interpretation of Chinese records. Other accounts distribute the retreat, revolts and Arab counterattacks across 653–658.
Because no discrete conquest of Khurasan and the Transoxianan Silk Road can be verified in 655, the listed event should not retain a solid-confidence date.
On 17 June 656 — 18 Dhu al-Hijjah 35 AH — provincial rebels killed the third caliph, Uthman ibn Affan, in his house in Medina. A modern scholarly synthesis describes him sitting almost alone reading the Quran when he was killed.
He had refused demands to abdicate, and members of the opposition broke into his residence.
The transmitted accounts disagree over the identities and actions of the individual killers; they do not support naming one agreed murderer.
The siege that ended there
Madelung's chronology dates this second siege from the rebels' return to Medina on 31 May, following an earlier stage on 1 May.
The opposition combined provincial grievances — especially from Egypt and Kufa — with critics inside Medina itself.
Traditional reports give different lengths for the siege overall, because they count from different starting points.
The pledge, one day later
Ali ibn Abi Talib received the pledge of allegiance on 18 June, the day after Uthman's death. The two were consecutive events rather than a single transfer of power.
The new government could not punish Uthman's killers without alienating armed supporters. Talha, al-Zubayr, Aisha and Muawiya — the Syrian governor and Uthman's Umayyad kinsman — soon challenged Ali, opening the First Fitna.
Ali also did not move his seat to Iraq that June. He left Medina on 25 October, defeated his Basran opponents at the Battle of the Camel in December, and based himself in Iraq thereafter.
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What the sources leave uncertain
The date 17 June 656 is well established in modern scholarly chronologies, but the transmitted accounts disagree over the identities and actions of the individual killers.
Accounts of Ali's protective efforts, the participation of his sons and his precise relationship with the rebels differ substantially across the sources.
Traditional reports give different lengths for the overall siege because they count different starting points.
No securely isolated conquest event sits in the calendar year 662. The best scholarly chronology puts the reopening of eastern campaigns in 41 AH — 661 — when Muawiya reappointed Abd Allah ibn Amir over Basra and its eastern dependencies.
During the First Fitna, Muslim garrisons and tax officials had lost control across much of Iran. Muawiya's victory allowed him to reappoint eastern commanders and begin suppressing revolts and restoring tribute.
Later historical traditions sometimes duplicate Ibn Amir's Uthman-era and Muawiya-era campaigns, which tangles the chronology further.
Sistan, then Kabul
Ibn Amir sent Abd al-Rahman ibn Samura to reconquer Sistan. His forces retook Zarang, Bost and al-Rukhkhaj, and entered Kabul after a siege.
Other lieutenants pacified eastern Khurasan and retook Balkh, where a commander is reported to have destroyed the Buddhist Nawbahar sanctuary.
Herat, Pushang and Badghis were paying tribute again by 43 AH / 663.
Recovered ground, not new ground
This was reconquest and suppression of revolt rather than the capture of untouched Persian territory. Local Iranian, Hephthalite and Zunbil rulers kept considerable power, and alternately resisted, negotiated tribute or accepted renewed Arab authority.
The Oxus still marked the limit. Encyclopaedia Iranica's chronology puts the start of raids across the river in 674.
Even the office-holders are unsettled: Iranica dates Abd Allah ibn Khazim's second governorship to 663–664 rather than 662.
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Date disputed. Sources disagree; the research places it at ~0662.
What the sources leave uncertain
The year 662 falls between the documented reopening of campaigns in 661 and the renewed tribute reported in 663; no source consulted identifies a single decisive operation in 662.
Later historical traditions sometimes duplicate Ibn Amir's Uthman-era and Muawiya-era campaigns, obscuring the chronology.
Some sources assign commanders and governorships to different years; for example, Encyclopaedia Iranica dates Abd Allah ibn Khazim's second governorship to 663–664 rather than 662.
Medieval tradition dates Uqba ibn Nafi's foundation of a new inland Kairouan to 50 AH — 670. In the conventional chronology he had taken command in Ifriqiya and, with a force reported as 10,000 men plus support from some Moorish groups, raided Capsa and Qastiliya before advancing to the site.
That date is traditional rather than independently fixed. A modern scholarly synthesis notes that it appears in only a minority of relatively late Arabic sources, while other chronicles place Uqba's arrival anywhere between 662–663 and 676–677.
Nor was it the first Arab camp of the name in the district. Mu'awiya ibn Hudayj had already established one called Kairouan at al-Qarn, northwest of Uqba's settlement.
A mosque, a palace, and five years of work
Construction began with a mosque and a nearby governor's palace, not with a finished city. The reported build time for the new capital is five years from 670.
What the site offered was a fixed inland base for administering and extending the Arab position in Ifriqiya without depending on the fortified, Byzantine-held coast.
No identifiable fabric of that first mosque survives; the Great Mosque standing at Kairouan is principally the product of later rebuilding.
Dismissed, and the seat moved north
The foundation did not settle Umayyad rule in Ifriqiya, and it did not end Byzantine or Berber resistance.
Uqba was dismissed in 675. His successor Abu al-Muhajir Dinar relocated the government settlement north.
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Traditional date. Conventionally dated here; the research places it at ~0670.
What the sources leave uncertain
The familiar date 670 is traditional rather than independently fixed by contemporary evidence. A modern scholarly synthesis notes that the date appears in only a minority of relatively late Arabic sources; other chronicles place Uqba's arrival between 662–663 and 676–677.
The 10,000 figure is reported in modern scholarship from narrative sources, but the stronger claim that all 10,000 were Arab horsemen is not securely established.
Foundation was a multi-year process. Sources also describe earlier camps in the same region, especially Mu'awiya ibn Hudayj's al-Qarn, so 670 was not the first Arab encampment there.
The officer who had blocked Husayn's road with a thousand horsemen crossed to his side on the morning of the battle and died fighting his former comrades.
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On 10 Muharram 61 AH — conventionally converted as 10 October 680 — Umar ibn Sa'd formed the Kufan army against Husayn ibn Ali's small party on the plain of Karbala in Iraq.
Ubayd Allah ibn Ziyad, the governor of Kufa, had rejected a settlement that would let Husayn depart without submitting. His final order required Umar ibn Sa'd to compel submission or attack, and the confrontation was postponed from the evening of 9 Muharram to the next morning.
Some modern reference works give 9 October instead, since historical calendar conversions can differ by a day.
Morning until near sunset
Al-Hurr ibn Yazid, who had earlier intercepted Husayn with 1,000 mounted men, defected to Husayn that morning and was killed fighting his former comrades.
Umar ibn Sa'd had brought 4,000 men to Karbala, with 500 posted to block access to the Euphrates. The fighting ran from morning until near sunset.
Husayn and almost all his able-bodied male relatives and supporters were killed; the traditional count of the dead on his side is 70 or 72.
The camp looted, the family taken
Husayn was beheaded, and his body was ordered trampled by horses. The victors looted his camp.
The surviving women and children and his sick son Ali were taken captive — first to Kufa, then to Yazid's court in Damascus. Husayn's sister Zaynab bint Ali was among them.
Yazid had demanded the allegiance and appointed Ubayd Allah to deal with Husayn, but he was not personally present at Karbala.
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Traditional date. This date is the conventional one, not one fixed by a contemporary record.
What the sources leave uncertain
The Islamic date, 10 Muharram 61 AH, is firm in the tradition. Conversion to the Julian calendar is usually given as 10 October 680, although some modern reference works give 9 October because historical calendar conversions can differ by a day.
Detailed narratives survive through later transmitters and disagree about individual speeches, wounds, negotiations and the exact number of combatants.
The commonly reported 70 or 72 deaths on Husayn's side is a traditional count, not a modern battlefield census.
A band of Arabic text roughly 240 metres long circles the shrine's interior arcades — and its date may record the start of the work rather than the finish.
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The shrine's monumental mosaic inscription carries the date 72 AH, which spans 691 and 692 CE and cannot be reduced securely to either year alone. The text proclaims Islamic beliefs through Qur'anic and other religious formulas that name Muhammad.
Most scholars have treated AH 72 as the completion date.
Marcus Milwright argues instead that the inscription more probably marks the building's foundation, and places completion in the mid-690s.
What Abd al-Malik built
The Umayyad caliph Abd al-Malik commissioned an octagonal shrine around the exposed rock on Jerusalem's Haram al-Sharif, during the Second Fitna. Later Jerusalem traditions name Raja ibn Haywa and Yazid ibn Salam as officials who oversaw the project.
It is a shrine centred on the rock, not a congregational mosque laid out like later Friday mosques. Its form and mosaics adapt late-antique and Byzantine Christian artistic traditions into a distinctly Islamic monumental statement.
Later tradition reports a budget of Egypt's land revenue for seven years — a literary report, not a documented cost.
Motive, and later hands
No contemporary text states the patron's motive. Competition with Jerusalem's Christian monuments is well supported as context; the claim that Abd al-Malik meant to divert the pilgrimage away from Mecca is a disputed interpretation drawn from later sources.
The building did not stay as he left it. Its surviving exterior and dome incorporate substantial later restoration and decoration.
The Abbasid caliph al-Ma'mun had his own name substituted for Abd al-Malik's in the dedication, while the AH 72 date was left intact.
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Date disputed. Sources disagree; the research places it at ~0691.
What the sources leave uncertain
AH 72 overlaps 691 and 692 CE; it cannot be reduced securely to the single Gregorian year 691.
Most scholarship interprets the dated inscription as recording completion, while Marcus Milwright argues that it records foundation and that work ended in the mid-690s.
No contemporary text states the patron's exact motive. Interpretations involving Christian competition, Jerusalem's sanctification, the Second Fitna and rivalry with Ibn al-Zubayr should be labeled interpretations.
Later Abbasid work replaced Abd al-Malik's name with al-Ma'mun's, although the AH 72 date was left intact.
The best-defined event attached to 710 is a reconnaissance raid. A detachment of 400 men under Tarif ibn Malluk reportedly crossed to the southern Iberian coast in Ramadan 91 AH, obtained booty without serious resistance, and returned.
July is the conventional conversion of that month. Other reconstructions place Ramadan 91 in August or September, because calendar conversions differ.
Tarif ibn Malluk is not Tariq ibn Ziyad, who commanded the much larger expedition of spring 711.
What the sources say about Julian
A ninth-century account by Ibn Abd al-Hakam says Musa ibn Nusayr left Tariq in command at Tangier with 1,700 men. It was written roughly a century and a half after the events and explicitly mixes legendary and historical material.
The same late narrative has a ruler called Julian exchange gifts with Tariq, offer to help him enter Iberia, and later ferry his men across. It does not describe an Arab army being invited into Ceuta.
Hugh Kennedy concludes that neither Julian's existence nor the truth of the story can be determined.
How the 711 expedition was decided
Musa's forces had reached the Strait of Gibraltar and wanted information about the opposite coast. In the conventional account, Tarif's raiders came back with booty and favourable news, and that persuaded Musa to entrust Tariq with the larger crossing.
The later story that Julian invited them in to avenge his daughter may preserve some memory of Visigothic discontent, but it cannot be treated as the established cause.
The daughter story is legendary: the surviving early Arabic version says Roderic made an unnamed daughter pregnant, and the name Florinda la Cava is much later.
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Date disputed. Sources disagree; the research places it at ~0710.
What the sources leave uncertain
The listed event combines several different claims: Tariq's Tangier command, Julian's alleged alliance and the separate 710 reconnaissance raid by Tarif.
There is no secure day for Tariq's appointment or for any supposed invitation at Ceuta. Even the 1,700-man report is dated only to 92 AH/710–711 in a much later source.
Julian's earliest substantial surviving narrative is in Ibn Abd al-Hakam, who died in 870 or 871. Hugh Kennedy concludes that neither Julian's existence nor the truth of the story can be determined.
The rape-or-seduction story about Julian's daughter is legendary. The surviving early Arabic version says Roderic made an unnamed daughter pregnant; the name Florinda la Cava is much later.
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