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Dawn, 9 August 378

Valens marched out of Adrianople at dawn on 9 August 378 toward Fritigern's wagon-ring, leaving the imperial treasury, the insignia and most of the baggage inside the city's defenses.

His men crossed eight Roman miles of rough ground in intense heat and reached the Gothic position during the afternoon, hungry and thirsty.

He had chosen to fight before Gratian's reinforcements arrived, on intelligence that understated the dispersed Gothic forces.

The parley that broke

Fritigern drew the negotiations out while the cavalry commanded by Alatheus and Saphrax came back. The western officer Richomeres had volunteered to go across as a high-status hostage.

Roman archers and targeteers attacked before that mission could set out, ending the parley with neither army fully prepared. The returning Gothic and Alan horse struck; the Roman cavalry was routed and the infantry compressed into a formation too crowded to fight effectively.

An emperor nobody could find

The army collapsed by nightfall. Ammianus says barely one Roman in three got away and counts thirty-five dead tribunes and unit commanders. The generals Trajanus and Sebastianus also fell.

Valens died in the rout and his body was never recovered. Ammianus preserves two incompatible accounts of how — a fatal arrow among the infantry, or burning inside a farmhouse.

The following day the victors attacked Adrianople itself to seize the treasury and the insignia, and the defenders repelled them.

What the constitution issued at Thessalonica ordered

Conventionally dated 27 February 380 — but possibly 28 February under Roman leap-year reckoning — a constitution was issued at Thessalonica in the names of Gratian, Valentinian II and Theodosius I, headed as an edict to the people of Constantinople. It required belief in one deity of Father, Son and Holy Spirit under equal majesty and in a holy Trinity, identifying that faith with Damasus of Rome and Peter, bishop of Alexandria.

Those who followed the rule were commanded to bear the name "Catholic Christians." Other Christian positions it branded heretical, and it declared that their meeting places could not be called churches.

It threatened divine vengeance and future imperial retribution, but specified no fine, prison term or execution.

The third day before the Kalends of March — 27 or 28 February?

The surviving legal text is dated by consular formula: the third day from the Kalends of March, in Gratian's fifth consulship and Theodosius's first. Reference editions, including the Roman Law Library's text of Codex Theodosianus XVI.1.2, convert that conventionally to 27 February.

Pál Sáry and earlier chronological scholarship read the same subscription differently. Because 380 was a Roman leap year, they argue, the civil date it names is 28 February.

Sáry's chronology also places the constitution before Theodosius's baptism later in 380.

Whose law it was, and how far it reached

All three emperors stand in the formal heading, but late Roman constitutions routinely named every lawful Augustus. Sáry argues that Theodosius alone issued this one.

Its reach is contested on the same evidence. Sáry reads it as binding Christian subjects within Theodosius's eastern jurisdiction; other accounts take the opening address to the peoples under imperial rule as empire-wide.

The text names neither Arius, nor Arianism, nor the bishop of Constantinople — though Demophilus's hold on the capital's churches explains why its own bishop could not be cited as an exemplar of the approved faith. Those churches passed to Nicene control only after Theodosius entered the city in November 380.

Two laws, February and June 391

No surviving decree of 391 announces that Christianity is now the official religion. What survives is a pair of constitutions issued months apart: one at Milan on 24 February, the other at Aquileia on 16 June.

The February text, preserved as Codex Theodosianus 16.10.10, prohibited sacrifice, entering temples for worship, and venerating cult statues. The June text, 16.10.11, repeated the ban and was addressed to Evagrius, Augustal prefect, and Romanus, count of Egypt.

The fines landed on officeholders

The February law disciplined officials in particular. A judge who entered a temple to worship owed fifteen Roman pounds of gold; his staff owed an equal amount unless they had opposed him and reported him publicly.

Consular officials faced six pounds and correctors or provincial governors four, with corresponding fines for their own staffs.

That law was directed to Albinus. The code's heading calls him praetorian prefect, but he was Rome's urban prefect — which makes Rome and the suburbicarian provinces the best-supported immediate jurisdiction.

No order to pull the temples down

Neither 391 law ordered temple buildings across the empire closed or destroyed. Both prohibited ritual access and sacrifice within specified administrative contexts.

The comprehensive prohibition that reached into private households — incense, lamps, wreaths, libations — is a separate constitution, 16.10.12, dated 8 November 392.

Legislation in 399 still ordered some emptied temple buildings preserved.

Pavia, 23 August 476

At Pavia on 23 August 476, troops serving in Italy mutinied and proclaimed Odoacer rex after negotiations with Orestes failed. Orestes fled toward Placentia.

Procopius, writing about sixty years later, says the soldiers had demanded one-third of Italy’s land from Orestes and turned to Odoacer when he refused. Chronicle traditions independently date the elevation to 23 August and describe the Heruli in Italy as creating him king.

Five days later

Placentia fell after a five-day siege, and Orestes was killed on 28 August. Odoacer then advanced on Ravenna, where Orestes’s brother Paulus was killed. Romulus’s removal is traditionally dated 4 September, but that date is disputed: a 2024 reassessment argues it marks Odoacer’s seizure of Ravenna rather than the abdication, and that Romulus may have remained nominally emperor for several more weeks, standing down later in 476.

The 23 August event was the army’s mutiny and acclamation, not Romulus’s deposition — that followed only after Orestes was defeated.

How much of this is solid

The securely attested title at the acclamation is rex. Translating it automatically as the formal territorial title “King of Italy” adds more precision than the evidence permits.

The one-third figure survives only in Procopius’s sixth-century account, and Hans-Ulrich Wiemer’s modern treatment cautions that the exact proportion is unlikely to be literal. Ancient authors also apply inconsistent labels — Heruli, Sciri, Alans, Rugii, Goths — to Odoacer and his following.

These were soldiers within the late Roman military establishment, not foreign tribes invading Italy from outside.

Two delegations, one audience

According to the surviving fragment of Malchus, an embassy from the Roman Senate reached Zeno at Constantinople in 476 and declared that the western territories no longer required a separate emperor, because one common emperor would suffice. In Malchus's account the senators described Odoacer as capable of protecting their affairs and asked Zeno to confer the patriciate on him and entrust him with the government of Italy.

Envoys from the exiled Julius Nepos arrived, the same fragment reports, on the same day. They congratulated Zeno on his restoration and requested money and an army to put Nepos back in Italy.

Zeno’s answer, and Zeno’s letter

Zeno, in Malchus's telling, rebuked the Senate for killing Anthemius and expelling Nepos, insisted that it should receive Nepos back, and said Odoacer should properly obtain the patriciate from Nepos.

He then sent Odoacer an imperial letter addressing him as patricius. Scholars disagree whether that amounted to a formal grant, an honorific mode of address, or recognition conditional on Nepos.

An arrangement left unresolved

The western imperial ornaments were transferred to Constantinople; the Anonymus Valesianus later records their return to Italy under Emperor Anastasius. Italy stayed under Odoacer’s effective rule while the formal relationship among Odoacer, Nepos and Zeno remained unsettled.

Malchus's history survives only as fragments transmitted through later excerptors, so the wording and the agency in that exchange are his rather than a transcript. The embassy is commonly placed in autumn 476, after Zeno recovered Constantinople in August, but no exact day survives and some reconstructions put related diplomacy in 477.

16 December 533: the constitution Tanta

Justinian issued the constitution Tanta on 16 December 533, addressed to the Senate, the people and the cities of the empire, announcing and confirming the completed Digest, or Pandects.

Tanta presented it as fifty books, in seven parts, of selected and edited extracts from the writings of earlier Roman jurists.

Every included extract, Justinian declared, carried equal authority and was to be treated as an expression of imperial law regardless of which jurist had written it.

Rules for handling the text

He prohibited courts from using the superseded juristic works and restricted commentary on the new compilation.

He also forbade scribal abbreviations, on the ground that they could corrupt the official text.

Fourteen days to get ready

Magistrates and praetorian prefects were ordered to publish the new material, and Tanta decreed that the Digest and the Institutes would acquire legal force on 30 December 533.

Justinian's own accounting in the same document: nearly 2,000 volumes and three million lines examined, reduced to no more than 150,000 lines, in three years rather than the ten first thought necessary.

Those totals are imperial claims made inside the promulgating constitution, not independent measurements.

A year of weak sunlight

During 536, Procopius recorded that the sun gave light without its customary brightness and resembled an eclipse for the whole year. His account concerns the Mediterranean world; it does not place the observation specifically in Constantinople.

Writing from Ostrogothic Italy, Cassiodorus described a bluish sun, absent midday shadows, weak heat, a cold and dry growing season, hardened fruit and bitter grapes. He ordered stored produce used against the scarcity he expected.

The Irish record compresses the year into three words — “failure of bread” — though that entry survives in a much later compilation whose annalistic dating is not exact.

What the ice and the trees record

Revised ice-core chronologies identify major volcanic aerosol loading associated with the sixth-century cooling, and tree rings register exceptional Northern Hemisphere cooling beginning in 536. Multiple tree-ring reconstructions rank 536, 1453 and 1601 as the coldest Northern Hemisphere summers of the Common Era.

The volcano itself has not been identified, and neither has its latitude. A 2008 ice-core study favoured a near-equatorial eruption; later volcanic-glass evidence pointed to Iceland, and other work has considered North America. The timing is loose too: the eruption may have occurred in late 535 or early 536, and some ice-core chronologies place the relevant sulfate layer at 533–534, give or take two years.

The 540 eruption was separate

A separate, stronger tropical eruption around 540 prolonged the cooling, and evidence produced by that later event should not be attributed to 536.

Christmas Eve 562, not 563

The reconstructed Hagia Sophia was consecrated again on 24 December 562, with Eutychius as patriarch. The festivities carried into the new year, which is one reason older accounts attach the event to 563.

The church was returning after a major reconstruction. Earthquake damage culminated in the partial collapse of its dome and eastern structural system on 7 May 558.

Part of the ruined vaulting reportedly stayed hanging in mid-air while the rest crashed onto the church floor.

A higher dome, not a patch

Justinian ordered the damaged vaulting removed and rebuilt under Isidore the Younger. The replacement dome was made higher than the 537 dome, and the arches and pendentives beneath it were modified.

Sixth-century sources differ over whether it rose twenty or thirty feet; on the twenty-foot reading that is about 6.24 metres in Byzantine units.

The rebuild gave the church substantially the sixth-century structural form that survives.

A 1,029-line guided tour

Early in 563, while the celebrations continued, the court poet Paul the Silentiary recited an elaborate description of the restored church, addressing Justinian and the patriarch.

The poem runs 1,029 lines and preserves detail of marble, silver, light and liturgical space. Its exact performance day is debated — 6 January has been proposed, but is not certain.

The figure of 20,000 pounds of gold attached to this entry is not substantiated by the scholarly sources consulted for it.

18 June 618, at Chang'an — not Luoyang

Li Yuan deposed the child emperor Yang You and ascended the throne as the first Tang emperor in 618, at Chang'an, the western capital.

He named the new dynasty Tang after his hereditary fief and proclaimed Wude — "Military Virtue" — as his reign era. A scholarly reconstruction identifies the accession as the jiazi day of the fifth lunar month, converted as 18 June, and places the ceremony in the Taiji Hall.

Two things he did not do

He did not capture Luoyang. The Sui general Wang Shichong soon enthroned another Sui prince, Yang Tong, there, and Tang forces did not take the city until Wang Shichong capitulated in 621.

He did not have Emperor Yang murdered either. Yuwen Huaji's coup had already killed him at Jiangdu — and that news is what removed the remaining rationale for Li Yuan's façade of governing as a loyal Sui regent.

A quarter of an empire

Calling the day the end of the Sui is a dynastic convention. Competing Sui courts and claimants survived outside Chang'an, and more than 200 rebel organizations were active around the transition, of which only about ten were serious contenders for an enduring regime.

The new court's northwestern territory contained less than a quarter of the former Sui population.

Li Yuan also did not proclaim himself "Emperor Gaozu" — that is the temple name by which he became known after his death.

Arrival at the edge of the oasis

According to the Hijra tradition preserved by al-Bukhari, Muhammad and Abu Bakr arrived on a Monday in Rabi al-Awwal of the year conventionally given as 622 and lodged among the Banu Amr ibn Awf at Quba, on the outskirts of Medina’s oasis.

Residents had been going out to the lava field each morning to wait, until the noon heat drove them home. A lookout finally spotted the travelers emerging from the desert shimmer.

The mosque at Quba

Muhammad stayed at Quba, established a mosque the tradition describes as founded on piety, and prayed there. How long he stayed is unsettled even within one collection: al-Bukhari preserves ten nights in one report and fourteen in another.

After leaving on a Friday, he held Friday prayer with his companions on the route into central Medina. Quran 9:108 does not name Quba, and classical interpretation disputed whether its “mosque founded on piety” meant Quba or Muhammad’s mosque in the central settlement.

Why the CE date keeps moving

September 20 and September 24, 622 are attempts to reconcile the traditional Monday-and-Friday sequence with different Hijri-calendar assumptions. The June 28 alternative comes from a different astronomical reconstruction; none of them is an independently documented contemporary CE date.

The Islamic date is contested too — early and later traditions disagree over whether the arrival fell on 8 or 12 Rabi al-Awwal. Scholars note that the recurring use of Monday, 12 Rabi al-Awwal for several major episodes in Muhammad’s life may reflect literary or symbolic chronology.

The command, and the count

Quran 2:144 directs Muhammad and the believers to turn toward the Sacred Mosque in Mecca, replacing their former direction of prayer. Traditions attributed to al-Bara ibn Azib say he had prayed toward Jerusalem for sixteen or seventeen months after reaching Medina.

Most historical sources place the change at mid-Sha‘ban 2 AH, conventionally about 11 February 624. That Common Era figure is a reconstructed correlation, not a contemporaneously recorded date.

Congregations turning mid-prayer

News moved fast. One report says an Ansar congregation turned toward the Kaaba while already bowing during the afternoon prayer.

A separate report says worshippers at Quba learned of the command during the following morning prayer and turned from the direction of Syria toward the Kaaba — beginning the prayer facing one way and finishing it facing another.

What the Quran does not supply

The familiar scene in which Muhammad himself receives the revelation and turns mid-prayer at the Mosque of the Two Qiblas is a later historical tradition. Quran 2:142–150 does not name Masjid al-Qiblatayn, and the strongest al-Bukhari reports describe other congregations receiving the news rather than locating the revelation there.

Al-Tabari records disagreement among early authorities: most placed the change halfway through Sha‘ban 2 AH, while other reports put it roughly two months earlier or counted sixteen rather than eighteen months after the Hijra.

The annotated SUNY translation gives “about 11 February 624” and cautions that the change may have followed a period of hesitation rather than one cleanly documented moment.

Nothing in 629 matches the claim

No consulted scholarly chronology identifies a summer 629 event in which Muhammad simultaneously unified and converted all the peninsula’s nomadic tribes, or prepared an expedition against Jews.

What the chronologies do place in 629 is the fulfilled pilgrimage to Mecca and the expedition or battle of Mu’ta, on the Byzantine–Ghassanid frontier.

The pieces belong to different years

A Baker Academic chronology places operations against the Jewish settlements of Khaybar and Fadak in 628, Mu’ta in 629, and the conquest of Mecca and the expedition to Tabuk in 630.

The influx of tribal delegations accepting Islam or seeking treaties is conventionally associated with 9 AH, principally 630–631, after the conquest of Mecca. Some representatives declared conversion; others came to negotiate treaties, and political allegiance, treaty submission and personal conversion were not interchangeable.

And the unification was not total

The year 629 overlaps portions of 7 and 8 AH, and conversions between early Islamic and Common Era dates vary. Even allowing for that, the claim still combines developments separated by at least 628 to 631.

Muhammad’s authority also remained contested afterward. Hunayn, the siege of Ta’if and, after his death, the Ridda conflicts all cut against an instantaneous total unification.