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A letter written on the way to Rome

The year 109 cannot be independently established; the conventional date is around 107–110, or more broadly the second decade of the second century.

Ignatius, bishop of Antioch, wrote from Troas to the Christian community at Smyrna while travelling as a prisoner toward Rome. The letter warned against Docetists, thanked the Smyrnaeans for their hospitality and defended the bishop's authority.

Smyrnaeans 8.2

In that passage Ignatius wrote that where Jesus Christ is present, there is the katholike ekklesia — the whole, or universal, Church. It is the earliest surviving occurrence of the phrase in Christian literature.

The same paragraph restricts the Eucharist, baptism and the love-feast to the bishop or to someone he authorizes.

What the phrase does not mean

"Catholic" here describes scope — whole or universal — and does not refer to the later Roman Catholic denomination. Nor does the passage concern Christian universalism, the doctrine that every person will ultimately be saved.

No evidence records a council, vote or proclamation in 109 by which the Church renamed itself. The date and even the historical setting of the Ignatian letters remain actively debated, with published alternatives placing them in the 130s, 140s or later.

A Cilician port, early August 117

Seriously ill during his eastern campaign in 117, Trajan abandoned plans for another Mesopotamian expedition and set out intending to sail to Italy, leaving Hadrian with the army in Syria.

He died at Selinus in Cilicia — later renamed Traianopolis, near modern Gazipaşa in Turkey. Sources differ over the exact day, commonly giving 7, 8 or 9 August 117.

Not simply "a stroke"

Cassius Dio's surviving epitome reports that Trajan had suffered a stroke leaving part of his body paralysed, and that he also had generalized dropsy. It preserves competing ancient explanations too — Trajan himself suspected poison.

Dio gives the reign as 19 years, 6 months and 15 days.

Plotina's announcement

Trajan's wife Plotina announced that he had adopted Hadrian on his deathbed. The army recognized Hadrian immediately and the Senate followed, but ancient sources preserve suspicions that the adoption had been arranged or fabricated after Trajan's death.

The Historia Augusta reports that Hadrian received the adoption papers on 9 August and the news of the death on 11 August.

The eastern settlement was already coming apart: Parthian resistance had revived, and Parthamaspates, Rome's client king, had already been rejected.

A decade of work, not a year

Around 125–126, work on the Pantheon's portico, fittings and dedication likely reached completion in Rome's Campus Martius.

The official reconstruction range is 118–125. Revised brick-stamp analysis instead favours a project running from about 113/114 to 125/126, and other modern summaries put completion or dedication as late as 128. No exact dedication date is preserved.

Trajan probably started it

Current archaeological interpretation commonly assigns the beginning of the present rebuilding to late in Trajan's reign and its completion to Hadrian, rather than treating it as an exclusively Hadrianic project.

The building it replaced had been damaged in the fires of 80 and 110.

43.3 metres across, 43.3 metres high

The finished building joined a traditional columned portico to the enormous concrete rotunda and dome that substantially survive today. Interior width and height are the same figure, so a sphere of that diameter would fit inside the rotunda.

Rain enters through an oculus about nine metres wide and leaves through 22 holes in the floor.

The façade kept a dedicatory inscription naming Marcus Agrippa as builder, despite the standing structure being a second-century reconstruction.

Betar, and the end of the revolt

The revolt is conventionally dated 132–135, with some scholarship extending its end into 136. Roman forces finished it by reducing the remaining rebel positions.

Eusebius associates the decisive final siege with Betar, where the defenders were worn down by hunger and thirst and the rebel leader was killed. Cassius Dio identifies Julius Severus as the general who worked by isolation, starvation and piecemeal reduction rather than one open battle.

The exclusion order

According to Eusebius, drawing on the earlier Ariston of Pella, Hadrian then issued orders preventing Jews from entering the country around Jerusalem or even viewing it from a distance.

Jerusalem became the Roman colony Aelia Capitolina. Eusebius says its population and Christian leadership became Gentile, with a bishop named Marcus succeeding the earlier line of bishops of Jewish ancestry, and the province of Judaea was renamed Syria Palaestina in the same period.

The diaspora did not begin here

Substantial Jewish communities had existed for centuries in Babylonia, Egypt, Cyrenaica, Syria, Asia Minor and Rome. The suppression devastated Jewish settlement in Judaea, but Jews went on living in the land of Israel in large numbers, especially outside Jerusalem.

The scale of the destruction is reported only in ancient claims: Dio gives 50 strongholds and 985 villages destroyed and 580,000 battle deaths excluding famine, disease and fire — figures historians have long debated.

The stone that rules out 140

Ptolemy's dated Canobic Inscription of 146/147 preserves an earlier version of several astronomical parameters that he corrected in the Almagest. The received text therefore cannot have been finished in 140.

About 150 CE is a scholarly reconstruction, not a record. No surviving evidence identifies a completion day, or even a securely established year.

Thirteen books of models and tables

Claudius Ptolemy, working at Alexandria in Roman Egypt, produced a systematic thirteen-book textbook of mathematical astronomy.

It supplied mathematical models and tables for calculating the positions of the Sun, the Moon, the five known planets and the fixed stars. Ptolemy had dated the Canobic Inscription by the tenth regnal year of Antoninus Pius, then revised those constants for the book.

It is principally a mathematical and computational treatise. Ptolemy developed more explicitly physical celestial constructions later, in the Planetary Hypotheses.

1,022 stars in 1,028 entries

The star catalogue runs to 1,028 entries covering 1,022 stars — the two numbers are not interchangeable.

How much of it came from Hipparchus is still argued. Scholarship supports the incorporation of Hipparchan material, but the extent and the catalogue's precise construction remain open questions.

Nor was the book called the Almagest when Ptolemy finished it. That name came later through Arabic transmission; his own title was Mathēmatikē Syntaxis.

Mesopotamia to Rome in under a year

A severe epidemic emerged in Mesopotamia in late 165 or early 166, during Lucius Verus's Roman campaign against the Parthian Empire.

It reached Rome in 166, less than a year after the eastern outbreak. Galen was in the city when it arrived, and he left soon afterwards.

The returning-army story

The traditional account links the disease's westward movement to soldiers coming home from the Parthian war. Recent scholarship cautions that this story may partly reflect imperial propaganda.

Galen met the epidemic again among troops at Aquileia in the winter of 168–169, recalling that both emperors fled toward Rome while much of the army stayed behind.

"Plague" here does not mean plague

The word denotes a destructive epidemic. It does not establish infection by Yersinia pestis, and this outbreak is not the Plague of Justinian, which began roughly 375 years later.

Galen's symptom descriptions suggest smallpox strongly to some medical historians, but no ancient DNA has identified the pathogen, and the National Library of Medicine describes the evidence as equivocal. The epidemic is securely attested at least until 180, possibly into Commodus's reign.

Not an event, a label

Nothing called "180–395 – Late Empire in Rome" happened in 180. It is a period label rather than a date-specific occurrence.

The exact range matches David Potter's modern survey The Roman Empire at Bay, AD 180–395, which treats political, cultural, intellectual and religious transformation across more than two centuries.

Two endpoints, two successions

At the opening boundary there is a defensible event: Marcus Aurelius's death on 17 March 180 left Commodus as sole emperor.

At the closing boundary there is another: Theodosius I died in 395, after which Arcadius governed in the East and Honorius in the West. Those are endpoints of a frame, not one occurrence.

Where scholars actually draw the line

There is no universally fixed beginning or end for the "Late Empire" or the "Late Roman" period. Oxford's Centre for Late Antiquity works with roughly AD 250–450.

The Crisis of the Third Century, conventionally AD 235–284, covers only part of the 180–395 span — and the four-ruler Tetrarchy was not created until 293.

17 March 180, somewhere on the Danube

Marcus Aurelius died on 17 March 180 while campaigning on Rome's northern frontier in Pannonia.

The precise place is still disputed — ancient and modern authorities variously give Vindobona, Sirmium, or another nearby Danubian base. His fatal illness cannot be diagnosed securely either, and no reliable evidence shows that Commodus murdered him.

Already an Augustus

Commodus had been Caesar since 166 and officially co-emperor since 177. His father's death made him sole ruler, not emperor for the first time.

The succession met no immediate opposition, and he soon abandoned Marcus's northern-war plans and made peace.

A label applied afterwards

"Five Good Emperors" is a retrospective evaluative phrase, not a Roman office or a formally proclaimed era. Nor did the date end the Nerva–Antonine dynasty, which continued under Commodus until 192.

Cassius Dio's famous verdict on the transition — gold giving way to iron and rust — belongs to his hostile retrospective, not to anything announced on succession day.

7 December 185, in the Southern Gate

On the sexagenary day gui-hai in the tenth lunar month of Zhongping 2 — conventionally converted to 7 December 185 — Chinese observers recorded the appearance of a "guest star."

They placed it "in the middle of" Nanmen, the Southern Gate asterism in the Centaurus region of the sky. The surviving notice comes through the Book of Later Han, compiled after the event, not from an observing log written that night.

What the record actually says

The received text describes the object with figurative language about its size and changing colours. These are historical descriptions, not calibrated angular-diameter or photometric measurements, and the phrase often rendered "half a bamboo mat" should not be read as a measured disk.

The record says the object diminished and eventually disappeared. The phrase naming the disappearance year has competing translations: about eight months of visibility if hou-nian means the succeeding year, about twenty if it means the year after next.

Probably a supernova

"Guest star" was an observational category, not an ancient diagnosis. A 1994 Nature paper read the record as a comet; a 1995 study proposed that a nova and a comet had been combined; a 2006 reanalysis argued that the absence of reported motion, and the language used elsewhere for comets, make a supernova overwhelmingly more likely.

The probable remnant is RCW 86, about 40 arcminutes across, with shocks measured above 3,000 km/s in its northeast region.

9 April 193, at Carnuntum

Soldiers at Carnuntum in Pannonia Superior — on the Danube, near modern Petronell-Carnuntum in Austria — acclaimed their governor, Lucius Septimius Severus, as emperor on 9 April 193.

The 14 April in this entry conflicts with the standard modern chronology. The Oxford Classical Dictionary, the Cambridge Ancient History and archaeological references for Carnuntum all use 9 April.

Vengeance as the platform

Severus presented his cause as vengeance for Pertinax, murdered by the Praetorian Guard on 28 March. Herodian says he first tested senior officers and prominent soldiers, appealed to their respect for Pertinax, and persuaded them to place imperial power in his hands — and calls the vengeance claim a pretext.

After the acclamation he sent word to neighbouring provinces and commanders, winning their support through promises and anticipated rewards.

Emperor of nothing yet

Didius Julianus still held Rome, and two other governors were potential rivals: Pescennius Niger in Syria, and Clodius Albinus in Britain, whom Severus temporarily neutralized by granting him the title Caesar.

Cassius Dio says Severus travelled surrounded by 600 selected men who did not take off their breastplates during the march. He entered Rome on 9 June 193.

Nothing is dated to 190

No source identifies an event, lecture or publication by Cleomedes in the year 190. The entry can only stand for an approximate composition or teaching date.

His life dates are unknown. The University of California Press edition places the lectures around 200 CE, and modern proposals have ranged from the first to the fourth century CE.

Right source, different mechanism

In his surviving astronomical lectures, Cleomedes taught that the Moon acquires its illumination from the Sun, and that its changing phases follow from its changing position relative to the Sun and Earth.

He did not describe reflection from the lunar surface in the modern sense. His Stoic account held that the Moon absorbs or mixes with solar light and then produces its own illumination.

Two lectures inside a philosophy course

The teaching belonged to a pair of elementary astronomical lectures embedded in a broader Stoic philosophical program — two books, not a research publication.

Cleomedes did not originate the idea that moonlight comes from the Sun; forms of it had been proposed centuries earlier. He preserves and adapts the ideas of Posidonius, an earlier Stoic authority rather than his personal mentor.

Around 200, with no exact year

Around 200 CE Judah ha-Nasi completed the final redaction of the Mishnah, assembling inherited tractates and placing them within an existing subject-based system — six orders, 63 tractates.

No contemporary source supplies a completion year. The conventional date stands for a redaction finished near the end of the second century or the beginning of the third.

A canon that keeps the arguments in

The result preserved majority, minority, named and anonymous rulings. It worked as a legal canon and a curriculum rather than a code containing only definitive judgments.

Once Judah's recension became the standard, traditions left outside it were reclassified as baraitot — material "outside" — while later discussion was absorbed into the Talmuds.

Published aloud

The Mishnah was initially taught and promulgated through oral recitation. Whether Judah himself issued a written edition remains debated.

So does the size of his own contribution: scholars disagree over how much of the final form he shaped and how much he inherited from earlier editors, and he probably received many nearly completed tractates.