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10 August 955, outside Augsburg

The Magyar army had been besieging Augsburg, where Bishop Ulrich with his knights and the city's inhabitants held out on 8 and 9 August 955. News that Otto I's relief army was approaching made the besiegers break off the siege and seek battle.

On the generally accepted chronology the armies met near Augsburg on 10 August. Thietmar dates it to St Lawrence's Day; Ruotger gives 9 August.

The battlefield has never been identified archaeologically, so Lechfeld should not be treated as a securely located spot.

The rear collapses, then recovers

Widukind reports that the Magyars crossed the Lech, struck Otto's rear, seized the baggage and routed successive rear divisions.

Duke Conrad the Red's Franconian division recovered the prisoners and booty and broke up the attackers; the main engagement then ended in a decisive defeat and eastward flight of the Magyar army.

Conrad was among Otto's dead.

The days after

Otto reached Augsburg by late afternoon. River crossings farther east were guarded, turning the pursuit over the following days into a wider destruction of the retreating forces.

Bulcsú, Lél and Súr were captured and transported to Regensburg, where they were hanged — not at Augsburg.

Widukind alone reports an imperial acclamation on the battlefield; the Augsburg historical project warns that it is uncorroborated and that Otto did not begin styling himself emperor afterwards.

A date reconstructed from the liturgy

Polish annalistic tradition records that Mieszko, ruler of the Polans, was baptized in 966. It does not supply 14 April.

That day is reconstructed because it was Holy Saturday in 966, and the Easter Vigil was a customary occasion for adult baptism. No surviving written source confirms it.

Even the year has been reconsidered: Tomasz Jurek has argued for 965.

Where, and by whom, are unknown

The place and the officiating cleric are not recorded. Poznań, Gniezno, Ostrów Lednicki, Regensburg and an imperial court have all been proposed.

One current scholarly reconstruction places the baptism in spring 966 — perhaps 14 April, perhaps Pentecost on 4 June — probably somewhere in Greater Poland, while another scholar argues for a baptism at an imperial court outside Mieszko's territory.

Thietmar's later account credits Mieszko's Christian wife Dobrawa of Bohemia with working to convert him, but Mieszko's own motives are not securely recorded.

One ruler, not a country

The person baptized was Mieszko, and probably members of his immediate entourage — not an entire population in one ceremony. Their identities and number are not recorded.

The rite made him and his baptized court Christians within the Latin Church, and he could begin sponsoring Latin Christian institutions and worship; conversion of the wider population was a prolonged process.

He already ruled an organized polity, and in 966 he did not yet rule all the territories later included in the Polish kingdom.

The khutba changes at the Mosque of Amr

On the Friday conventionally dated 9 July 969, the sermon in the old Mosque of Amr at Fustat was delivered for the Fatimid imam-caliph al-Mu'izz rather than for the Abbasid caliph, publicly marking the new allegiance of Egypt's principal mosque. Conversion of the Islamic date produces 8 July in some modern scholarship; the underlying source describes it as a Friday with ten days remaining in Sha'ban.

Jawhar, the commander who had taken the city for al-Mu'izz, attended with his army. The preacher appeared in Fatimid white in place of Abbasid black.

The sermon added explicitly Shi'i invocations for Muhammad, Ali, Fatima, Hasan, Husayn and the Fatimid imam-caliph's ancestors.

The written guarantee that came first

The ceremony followed a negotiated guarantee of safety for Fustat, and limited fighting against Ikhshidid and Kafurid soldiers who had rejected the agreement.

A delegation of five negotiated that guarantee on behalf of the city's notables. Abu Ja'far Muslim al-Husayni led it and later helped renew it; Ja'far ibn al-Furat, the Ikhshidid vizier, represented the surviving Egyptian administration during the transition.

Jawhar's written guarantee protected life and property and allowed the Sunni legal schools to continue.

A royal enclosure goes up beside the city

By this point Jawhar's forces controlled Fustat and Ikhshidid government there had ended. He immediately began accommodating the existing communities while constructing a new royal enclosure to the north — about two miles from Fustat, as the Cambridge History of Egypt summarizes it.

That enclosure was the beginning of the city now called Cairo. Fustat was not built over; it continued as a major populated and commercial city beside the new Fatimid royal centre.

Jawhar governed Egypt in the caliph's absence.

A consecration at Noyon, on one of two possible days

On the chronology supported by Parisian and Sens sources, Archbishop Adalbero of Reims and other bishops consecrated and crowned Hugh Capet at Noyon on 3 July 987.

Two medieval source groups disagree. Richer and Gerbert support 1 June; the Parisian and Sens material supports 3 July. Jean-François Lemarignier judged the evidence on the two dates approximately equal and revived the possibility that Hugh underwent two ceremonies.

Modern scholarship accordingly gives 1 June, 3 July, or a coronation 'probably in July.'

Why Hugh and not Charles

Louis V had died childless in May, and the vacancy set the nearest Carolingian claim against the magnates' preference. Charles of Lower Lorraine, the dead king's paternal uncle, was passed over.

Richer's near-contemporary account portrays Adalbero arguing that kingship was not acquired by hereditary right, and recommending Hugh's character, nobility and military following.

The assembled magnates then acclaimed Hugh.

What the crown settled and what it left open

The ceremony converted the magnates' selection of Hugh, previously duke of the Franks, into a sacral kingship. The title he took was king of the Franks, not the later 'king of France.'

It did not eliminate Carolingian opposition. Charles remained a claimant, and Hugh's position was not definitively secured until Charles's defeat in 991.

The poem dates itself

Ferdowsi dated the completion of the Shahnameh to the 25th day of Esfand, converted by the cited scholarship to 8 March 1010, and described himself as being in his seventy-first year.

The date comes from verses at the poem's end and from calendar conversion, not from an independent contemporary administrative record.

A revision, not a first draft

This was a final or revised recension rather than the first completed form. Encyclopaedia Iranica reports that Ferdowsi had completed a first version by 994 and continued revising it until 1010.

The poem versified an earlier New Persian prose Shahnameh, commissioned by Abu Mansur Muhammad ibn Abd-al-Razzaq and completed in 957. It also incorporates roughly a thousand verses by the earlier poet Daqiqi, on Goshtasp and the advent of Zoroastrianism.

Some scholars have proposed revisions after 1010, but Encyclopaedia Iranica rejects the principal argument for extending the final revision to 1018–19.

What the finished recension contained

The completed poem runs to about 50,000 double verses. Its Arabic-derived vocabulary has been counted at 706 distinct words occurring 8,938 times — 8.8 per cent of the distinct vocabulary, but only 2.4 per cent of running-word occurrences.

Ferdowsi added praise of Sultan Mahmud of Ghazna to the work. The later stories about the poem's presentation and the failed reward are preserved in sources written after the event and contain legendary elements.

One such account says Ali Daylam prepared a seven-volume manuscript and that Ferdowsi travelled toward Ghazna with the reciter Abu Dolaf; Encyclopaedia Iranica treats the surrounding presentation story cautiously.

The 1010 date is a convention

No evidence identifies a completion, or any other discrete event, in 1010. The work was composed gradually in the early eleventh century, before and during Murasaki Shikibu's service at court.

Museum chronology therefore dates the work broadly to about 1000, or to the early eleventh century, rather than to a securely documented year of completion.

What the diary actually records

Murasaki's diary establishes that portions of Genji were already circulating at the imperial court in 1008. It records court personnel preparing copies with fine paper, brushes and ink, and it associates Fujiwara no Michinaga with supplying those materials.

Murasaki served as a lady-in-waiting in the household of Empress Shoshi, where chapters were copied and read. 'Murasaki Shikibu' is an appellation rather than a securely known personal name.

The diary says Emperor Ichijo heard part of the tale and commented on its author's learning.

The outer bounds of the guess

The diary proves that at least some of the tale existed in 1008, but it does not say how many chapters were then complete. Chapters circulated in manuscript within a courtly network; there was no publication day.

The Sarashina Diary indicates that a fifty-plus-chapter collection was circulating by about 1020–21. That sets a later bound for something close to the received fifty-four-chapter form, rather than proving an authorial completion date.

The order of composition, the completeness of the ending and the authorship of the latest chapters have all been debated; a recent quantitative study supports single authorship but does not settle the date.

What the 1027 date rests on

The best support for 1027 is an approximate completion chronology: Avicenna's students requested the encyclopedia at Hamadan in 1016, and the Internet Encyclopedia of Philosophy says he completed it in Isfahan by 1027.

The date does not represent modern publication. The work circulated as manuscripts, and no contemporary source describes a launch, a publisher or a single release day.

A seventeen-year job, repeatedly interrupted

Abu Ubayd al-Juzjani — student, amanuensis and biographer — had asked for a comprehensive treatment of the Aristotelian sciences, and he supplies the principal narrative of how the work was written. He reports a composition period of seventeen years, with interruptions.

Political upheaval, imprisonment, travel and the loss of portions during a campaign broke up the project. Avicenna finished the main body at the Isfahan court of the Kakuyid ruler Ala al-Dawla.

No autograph manuscript by Avicenna or Juzjani survives.

Where the claim of finality breaks

Reference works disagree about what 'completed' means here. Encyclopaedia Iranica, following Juzjani, says the books on plants and animals were written during a campaign probably in 1032, and that part of the zoology remained unfinished.

What was assembled was logic, natural philosophy, mathematics and metaphysics, gathered into a comprehensive Arabic philosophical summa that revised and expanded the Aristotelian curriculum.

Its modern Cairo edition occupies 22 large volumes.

A midpoint, not a record

The year 1045 does not appear in the source. Shen Kuo's later account places Bi Sheng's invention somewhere in the Qingli reign period, 1041–1048, without identifying a year or any particular day.

1045 is only a midpoint convention inside that eight-year range. Shen wrote decades after the invention, although his family reportedly possessed the original type.

How the clay type worked

Bi Sheng carved individual characters in sticky clay, hardened them with fire, and arranged them within an iron frame on an iron board coated with resinous adhesive and paper ash.

He heated and levelled the assembled form, printed from it, then reheated it to release the characters. The reusable pieces were stored in compartments organised by rhyme.

He worked two boards alternately — one printing while the next was being composed — and kept more than twenty duplicate pieces for very common characters such as zhi and ye.

What it did not change

Shen said the method became efficient at the scale of hundreds or thousands of copies. He introduces it against an established Song book industry dominated by carved woodblocks, for which every page required a fixed block.

No specific book, customer or immediate large-scale adoption is documented, and woodblock printing remained the preferred Chinese method for centuries. Scholars have debated what clay compound was used, and whether ordinary fired clay would have had the durability and ink behaviour required.

Shen Kuo reports that after Bi Sheng died, members of Shen's own extended family obtained and preserved the type.

Where 1064 comes from

The year 1064 is a modern correlation rather than a date from a contemporary record. Domingo Chimalpahin's Memorial of Colhuacan, as translated and analysed by Rafael Tena, assigns the departure to the Indigenous year 1 Tecpatl and correlates that with 1064.

The Memorial says the Azteca Mexitin Teochichimeca left their dwelling at Aztlan and separated from its other inhabitants. Chimalpahin was writing in the early seventeenth century.

The codex gives a sign, not a year

The migration codex known as the Tira de la Peregrinación, or Codex Boturini, likewise begins with the Mexica leaving Aztlan in 1 Tecpatl — but the codex itself supplies no European-calendar equivalent.

Tena argued that a 52-year cycle omitted from the Tira reconciles its chronology with Chimalpahin's date: 188 visible year boxes plus one hypothesised missing cycle, representing 240 years from 1064 through 1303.

Read without that omission, the Tira can instead suggest 1116, while later correlations added to the Aubin and Azcatitlan codices give 1168.

What the exact day cannot support

No consulted scholarly source supports 4 January 1064 as the day of departure. The evidence supports, at most, a traditional year-level date.

The surviving migration sources are colonial-period records combining historical chronology, ancestral memory, political identity and mythic elements. Aztlan's location — and, in some interpretations, its historical existence — remains unresolved.

Tena tentatively connects the departure to the decline of the Toltec political order, but the precise historical trigger cannot be recovered.

March, not April

An undated list headed Dictatus papae was entered in the original register of Pope Gregory VII between entries dated 3 and 4 March 1075 — not in April.

The entry itself carries no date. March 1075 is inferred securely from its position in the chronologically organised original register, where it stands as Book II, entry 55a.

Gregory's conflict with Henry IV intensified in that same month, and may form part of the entry's context.

Twenty-seven propositions

The entry consists of 27 short propositions or headings concerning the Roman Church and papal powers over bishops, councils, judgments, emperors, and subjects' fidelity to unjust rulers.

One proposition lets the pope depose emperors; another releases subjects from fidelity to unjust rulers. Most of the rest concern ecclesiastical governance.

Proposition 22 says the Roman Church has not erred; equating that directly with the later formal doctrine of papal infallibility is anachronistic.

How little it travelled

The register gives no indication that the propositions were promulgated or distributed that day, and scholarship describes their circulation and direct canonical reception as extremely limited.

The intended genre and audience remain uncertain. Proposed interpretations include a private memorandum, guidance for papal legates, and chapter headings for a planned canon-law collection. Whether Gregory personally composed or dictated every proposition is disputed.

The canonist Deusdedit's collection of 1087 resembles parts of the Dictatus, and older scholarship used that resemblance to propose his authorship or a later compilation.

No charter, no ceremony

No surviving charter, ceremony or dated corporate act records the foundation of a university at Bologna in 1088. The university itself calls 1088 a conventional date for the Studium's gradual emergence.

The early Bologna schools arose spontaneously around independent teachers and students, rather than through an act of a pope, an emperor or an identified founder. There is no verified month or day.

The year was fixed in the 1880s

The specific 1088 anniversary date was adopted retrospectively for Bologna's eighth-centenary celebration, held on 12 June 1888.

The university describes the date as arbitrarily suggested by Corrado Ricci and supported by Giosuè Carducci and Cesare Albicini.

Their anniversary project fixed the date in modern institutional memory.

The founder who wasn't

Irnerius, a teacher of liberal arts and Roman law, was an important figure in the emerging law schools. Bologna's own history explicitly warns that he was not a sole founder.

Students formed associations, paid teachers directly, and helped shape instruction; teachers sometimes taught them inside their own homes.

The imperial decree known as the Authentica Habita, dated to approximately 1154–1155, protected travelling scholars — it did not found the university.

Friday, 8 July 1099: a fast and a circuit of the walls

On Friday, 8 July 1099, the crusading army fasted and processed outside Jerusalem's walls as part of its preparation for another assault. This was not a storming attempt; the failed first assault had come in mid-June.

Raymond of Aguilers says clergy carrying crosses and saints' relics led the procession, followed by knights and other able-bodied men with trumpets, standards and arms.

The participants walked barefoot.

Reconciliation at the Mount of Olives

The priest Peter Desiderius had claimed, Raymond reports, that the dead papal legate Adhemar of Le Puy appeared to him and ordered fasting, purification and a barefoot circuit of the city.

At the Mount of Olives the participants were exhorted to forgive one another. Raymond reports a public reconciliation and the giving of offerings.

He took part in the crusade himself, but his narrative interprets events providentially and should not be read as neutral reportage.

Nothing fell that day

Jerusalem's defenders watched from the walls and mocked the procession and its crosses.

The city neither surrendered nor fell, and the crusaders returned to their siege work afterward.

The next general assault began on 13 July, and Jerusalem was breached and captured on 15 July.