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Three dates for one rise

The traditional date for Ardashir's accession as king of Persis is 208. No secure contemporary narrative fixes the fraternal revolt there.

An Encyclopaedia Iranica chronology puts his open rebellion in 212, while another interpretation of a Bishapur inscription places an early stage of the family revolt or consolidation in 205–206.

The brother in the story, and the brother on the coins

In the traditional reconstruction, Papak's elder son Shapur became king of Persis; Ardashir rebelled against him and took the kingship after Shapur died suddenly in an accident — if that later tradition can be trusted.

Coins confirm that Shapur ruled as king and associated himself with his father Papak. They do not establish a securely dated fraternal war in 208.

Not the founding of an empire

Ardashir did not establish the Sasanian imperial regime in 208. Local control of Istakhr or Persis was not the same thing as overthrowing the Arsacid King of Kings.

That came later: he defeated the Arsacid king Artabanus at Hormozdgan on 28 April 224 and assumed the title King of Kings — sixteen years after the traditional accession date.

A province handed over, then a refusal

In 208, after Liu Biao died, his son Liu Cong surrendered Jing Province to Cao Cao. Cao seized the naval base and fleet at Jiangling, pursued Liu Bei and Liu Qi eastward, and called on Sun Quan to surrender as well.

Sun Quan chose resistance and sent Zhou Yu and Cheng Pu with ships and troops. The combined force met Cao Cao on the Yangtze, between present-day Wuhan and Yueyang, late in 208.

Fire ships with a following wind

Cao Cao's first attack was driven back. His northern soldiers were exhausted and sickness was present in the camp.

Zhou Yu's officer Huang Gai feigned surrender and prepared fire ships loaded with dry reeds, bundled wood and fatty oil; their crews escaped in small boats tied to the sterns. A following wind drove the burning vessels into Cao Cao's fleet and camp.

The early accounts cannot agree on how many there were — ten in the Zizhi Tongjian, several tens in the Sanguozhi.

The numbers are rhetoric

Cao Cao's letter to Sun Quan boasted of 800,000 soldiers and sailors. Zhou Yu treated that as propaganda and asked for 30,000 selected troops; Zhuge Liang's claim of 10,000 each for Liu Bei and Liu Qi is probably exaggerated too.

Zhou Yu followed the fire attack with light troops, throwing Cao Cao's army into confusion and forcing it to retreat. Cao Cao burned the ships he could not take with him.

One enactment, sixteen surviving lines

Caracalla issued an enactment — probably an edict — granting Roman citizenship to all or almost all free inhabitants of the empire who did not already hold it. It is traditionally dated 212, though the Oxford Classical Dictionary allows 212 or early 213, and no promulgation day is secure.

What survives is a damaged Greek text on Papyrus Gissensis 40: sixteen lines in its battered left column. Even its identification as the edict has generated scholarly controversy.

Thanks to the gods, or a tax bill

The papyrus presents the grant as an act of gratitude to the gods, and appears to except a group called dediticii whose identity remains disputed.

Cassius Dio, a hostile contemporary, instead attributed the grant to Caracalla's wish to enlarge revenue from taxes that noncitizens had not paid. The jurist Ulpian, in a passage preserved as Digest 1.5.17, simply states that those in the Roman world were made citizens by the constitution of Emperor Antoninus.

What it did not do

Recipients acquired Roman citizenship in addition to their existing local civic identities. The enactment did not abolish local laws, privileges or community obligations.

Nor did it enfranchise a wholly excluded population: Myles Lavan's high-uncertainty model estimates that as many as a third of free provincials may already have been citizens.

Epigraphic evidence soon shows many of the new citizens using the imperial nomen Aurelius.

Sixteen days of ceremony

Emperor Xian issued his abdication edict on 25 November 220. What followed was a sequence of petitions, debates and ritual refusals by Cao Pi.

At an accession ceremony on or about 11 December, Cao Pi received the abdication and became sovereign of the new imperial state of Wei.

Omens entered into the record

Memorials, omens and prophecies were presented to frame the transfer as Cao Pi's receipt of the Mandate of Heaven rather than an unceremonious seizure. One omen held that Han would be ended by "Xuchang" — the name of the city where the captive Han court resided.

Scholarship notes that the ritual language of voluntary abdication should not conceal the coercion: the last ruler in such transfers had no real choice.

The day did not create three kingdoms

The accession ended Emperor Xian's reign and the Eastern Han imperial government, and Liu Xie was enfeoffed as Duke of Shanyang.

Sun Quan still maintained formal allegiance to the new emperor for the moment, and Liu Bei did not claim the continuing Han imperial title until 221.

Even the ceremony's date is contested by a day: the Records of the Three States gives 10 December, while its annotations and the Zizhi Tongjian give 11 December.

Crowned in 226, or captured in 227

Having overthrown the Arsacid king Artabanus, the Sasanian ruler Ardashir I took Ctesiphon in Mesopotamia and folded the former Parthian royal centre into his new empire; sources cited by Encyclopaedia Iranica place his formal coronation there in 226.

Another Iranica entry dates the city's capture to 227 instead. No exact day is supported by either.

The decisive battle was two years earlier

Arsacid power had already been broken at Hormozdgan in 224, when Artabanus was defeated — two years before the conventional coronation date.

The sources support a sequence rather than a climax: Artabanus's defeat, then Ctesiphon's capture, then the coronation. They do not support a single datable battle inside the city in 226.

The city kept working

Calling this a fall suggests destruction or a sack. What changed was ownership — the old Arsacid winter residence and administrative centre passed to a new royal house.

Ctesiphon went on as the capital and coronation city of the Sasanian Empire rather than being abandoned or destroyed in the transfer.

The date moved

The year 181 is obsolete. The best radiocarbon date is 232 ± 10 CE at 95% probability, and a 2023 Antarctic cryptotephra study independently produced 230 ± 19 CE from chemically matched Taupō glass.

The old 181 and 186 dates came from incorrectly associated ice-core or historical phenomena and are no longer viable — which means red skies reported at Rome and in China around 186 cannot be effects of this eruption.

Five phases, then the sixth

In the austral late summer or early autumn of about 232 CE, Taupō volcano beneath Lake Taupō began a complex rhyolitic eruption that ran for several days to several weeks.

Five contrasting pyroclastic-fall units were laid down before the climactic sixth phase emplaced the Taupō ignimbrite across central North Island.

Twenty thousand square kilometres in fifteen minutes

Collapse of an eruption column roughly 35 to 40 kilometres high generated a hot, extremely fast pyroclastic density current — about 600 to 900 km/h — that crossed ridges and covered around 20,000 km² in approximately 10 to 15 minutes.

Caldera collapse during the eruption formed a new basin inside the older Ōruanui caldera beneath the lake. The ignimbrite filled valleys and depressions, buried drainage networks and blocked the Waikato River outlet from the lake basin.

A boundary drawn by modern scholars

There was no identifiable event in 200 CE, or in 250, when Maya people declared a new age.

Archaeologists conventionally place the start of the Classic period at around 250 CE, running to about 900 — which makes the listed year earlier than the usual textbook boundary.

The criterion is carved stone

The boundary is associated particularly with the appearance and increasingly widespread use of dated royal monuments, though such monuments were unusual rather than wholly absent before 250.

Tikal Stela 29 carries a Long Count date corresponding to 292 CE and portrays a richly equipped figure thought to be a dynastic ruler. It is a prominent early example — and it falls 42 years after the conventional line.

The change was gradual and uneven

Substantial Maya cities, monumental construction, political institutions, writing and calendrical practices already existed during the Preclassic period.

Classic-period boundaries also vary by scholar, site and region. Changes in pottery, architecture, kingship and inscriptions did not occur simultaneously across the Maya region.

Somewhere among the Catalauni

In 274 Aurelian defeated the forces of the rival emperor Tetricus in the territory of the Catalauni in Gaul — the location given by the fourth-century historian Eutropius, who writes apud Catalaunos.

That year is the dominant modern dating, though 273 also appears in scholarship, and estimates of the month range from March to April–May. The surviving accounts supply no securely convertible day, and Eutropius's phrase does not fix a battlefield beside modern Châlons-en-Champagne.

A surrender, and a story about it

Tetricus surrendered. Aurelian was left recognized across the former Gallic regime's western territories, and that separate imperial government ceased to function.

Ancient authors say Tetricus secretly arranged the surrender and betrayed his own army. Modern scholarship treats that as a literary tradition rather than a demonstrated battlefield fact, and possibly as pro-Aurelian propaganda; even the scale and character of the fighting are disputed.

Paraded, then given a province to run

Aurelian spared him. Eutropius reports that the former rival later served as corrector of Lucania and lived for a long time as a private citizen.

One caution about the name: two battles nearly two centuries apart are routinely called the Battle of Châlons or the Catalaunian Plains. This one involved Tetricus; the other, in 451, involved Attila.

A date reconstructed twice over

The 2 March 274 in this entry comes from reconciling an Old Turkish colophon and Chinese chronology with an older chronology of the Sasanian kings.

Manichaean tradition itself preserves only a Monday, the fourth day of Adar in early spring — no unambiguous Common Era year. Revised Sasanian chronology places Bahram I's reign at 274–277 and makes a death near its end more likely, so roughly February 277 is the better-supported placement.

Arrested after a humiliating audience

When Bahram I came to power, Zoroastrian clergy accused Mani; Encyclopaedia Iranica identifies the high priest Kerdir as the moving force behind the campaign at court.

Mani defied a ban by appearing at the royal centre at Beth Lapat in Khuzestan. He was made to wait beside a watch-post while the king finished eating and left to hunt, endured a humiliating audience, and was arrested.

He wrote one last work in chains, the Letter of the Seal. The traditional 26 days of imprisonment may be a hagiographically stylized number.

Died in prison, mutilated after

Critical analysis of the Manichaean sources concludes that Mani died in prison rather than being executed alive. The famous story that he was flayed alive is not historically secure; postmortem decapitation and display of his head are much better supported.

His followers installed Mar Sisin as successor, handing over Mani's Gospel, the illustrated Ardhang, his garment and his walking stick as tokens of office.

1 May 280, at Jianye

The Eastern Wu ruler Sun Hao capitulated at Jianye — modern Nanjing — on 1 May 280. A modern Cambridge history identifies this surrender as the act that marked imperial reunification.

Several Jin commanders were converging on the city. Wang Jun arrived by fleet and accepted the surrender ahead of the others.

Bound, with a coffin

Sun Hao presented himself bound and accompanied by a coffin — a ritual acknowledgment that his life was at the victor's disposal. Wang Jun released him and burned the coffin.

Getting there had taken engineering: Wang Jun's fleet neutralized Wu's submerged iron spikes with great timber rafts and burned through the river chains with oil-soaked torches.

The maps and registers changed hands

Eastern Wu's government ended immediately, and its maps and registers were seized: four provinces, 43 commanderies and 313 counties, with 2.3 million people in 523,000 households.

Those are figures transmitted from captured official registers, not modern census measurements. Sun Hao and his household were sent on to the Jin capital, Luoyang.

Nothing is recorded for 280

No surviving source records the Gupta Empire being founded in 280, or describes any datable event that year.

The date is an approximate modern reconstruction, worked backwards from later genealogy and estimated reign lengths. Under one such reconstruction rule passed from Gupta to Ghatotkacha around this time, but the transition is not independently dated.

What the Allahabad Praśasti actually says

The fourth-century inscription, composed by the court poet Harishena, retrospectively identifies Gupta as Samudragupta's great-grandfather, followed by Ghatotkacha and Chandragupta I. It gives the genealogy and no reign dates for the first two rulers.

It also shifts titles across three generations: Gupta and Ghatotkacha are called mahārāja, Chandragupta I mahārājādhirāja. That is evidence for a later rise in dynastic status, not proof of an empire already existing in 280.

The coins that were meant to settle it

A group of 106 silver pieces attributed by their publishers to Sri Gupta surfaced through coin dealers rather than an excavation, and both the attribution and the provenance have been challenged.

Museum chronologies commonly begin the recognizably imperial Gupta period around 320–321, associated with Chandragupta I.

Posted at Nicomedia, 30 April 311

Lactantius dates the publication precisely, to the day before the Kalends of May in 311. The measure was associated with the gravely ill Galerius, who died shortly afterwards.

It allowed Christians to be Christians again and to hold assemblies — provided that they did nothing contrary to public order. This was conditional toleration, not unrestricted religious freedom.

The price of the concession

Christians were instructed to pray to their God for the emperors, the Roman state and themselves. Provincial officials were promised further instructions.

The text also concedes that coercion had failed: many Christians had remained steadfast, while some who were forced to comply ended up worshipping neither the traditional gods nor the Christian God.

Uneven in practice

Lactantius says the prison gates opened after publication, and that his fellow Christian Donatus — confined six years — was released with other confessors.

The measure took immediate effect in Galerius's territory and apparently in Licinius's, but was not fully implemented in Maximin Daia's, where local persecution resumed later in 311.

Serdica, often attached to the edict's name, is the probable but not certain place of original promulgation; Nicomedia is where publication is securely attested.