308
- January 16
- Saint Marcellus I dies, ending his reign as Catholic Pope. [1]
309
- February 16
- Pamphilus van Caesarea, Palestinian scholar/martyr, beheaded. [1]
310
- April 18
- Saint Eusebius begins his reign as Catholic Pope. [1]
- October 21
- Saint Eusebius ends his reign as Catholic Pope. [1]
311
- April 30
- Emperor Galerius recognizes Christians legally in the Roman Empire. [1]
- May 5
- Gaius VM Galerius, emperor of Rome, dies at about age 50. [1]
- July 2
- (or 310) Saint Militiades begins his reign as Catholic Pope. [1] [697.176]
312
- January 7
- Lucianus of Antioch, theologist/saint, dies. [1]
- (month unknown)
- Emperor Constantine likely witnesses a meteor strike in central Italy (modern-day Cratere del Sirente), with numerous secondary craters. [521]
- October 27
- Emperor Constantine the Great defeats Emperor Maxentius at Milvian Bridge. [697.176] (October 28 [1426.28])
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313
- January 1
- Emperor Constantine establishes Roman (Pontifical) Indiction taxation cycle. [1] [697.54]
- April 30
- Gaius G V Maximus [Daia], Emperor of Rome, dies. [1]
314
- January 11
- Death of Pope Militiades. [1] [697.176]
- January 31
- Saint Silvester I begins his reign as Catholic Pope. [1]
321
- March 7
- Roman emperor Constantine orders Sunday be a day of rest. [1391.8]
325
- May 20
- First Christian ecumenical council opens at Nicaea, Asia Minor. [1]
329
- January 1
- Kontantinus (Konstantin's Son) becomes Caesar of the Western Roman Empire. His capital is Trier. [37]
335
- December 31
- Saint Silvester I ends his reign as Catholic Pope. [1]
336
- January 18
- Saint Mark begins his reign as Catholic Pope. [1]
- October 7
- Saint Mark ends his reign as Catholic Pope. [1]
337
- February 6
- Saint Julius I begins his reign as Catholic Pope. [1]
- May 22
- Death of Constantine the Great; emperor of the Roman Empire (306-337). [1] [37]
- December 25
- Earliest possible date that Christmas is celebrated on December 25th. [1]
347
- May 14
- Pachomius, Egyptian monastery founder/abbot (Coenobieten), dies. [1]
350
- January 18
- General Maxentius drives out Western Roman emperor Constans. [1]
- (month unknown)
- (4th century) Roman Ammianus Marcellinus directs treasure-hunters to search for underground galleries below the pyramids of Egypt. [1618.86]
352
- April 12
- Saint Julius I dies, ending his reign as Catholic Pope (337-352). [1]
- May 17
- Liberius begins his reign as Catholic Pope replacing Julius I. [1]
- December 25
- First definite date Christmas is celebrated on December 25th. [1]
356
- February 19
- Emperor Constantius II shuts all heathen temples. [1]
357
- April 28
- Emperor Constantius II visits Rome. [1]
364
- February 17
- Flavius Jovianus, Christian emperor of Rome (363-64), dies at about age 32. [1]
365
- July 21
- In the Greece - Crete - Knossos area, a large earthquake occurs. This earthquake affected the eastern Mediterranean region, including Italy, Greece, Palestine, and North Africa. Coastal towns in the region are leveled and a tsunami destroys the Egyptian port of Alexandria, and the famous lighthouse. Some 50,000 people may have been killed. [53]
- November 22
- Felix II ends his reign as Catholic Pope. [1]
366
- September 24
- Liberius ends his reign as Catholic Pope. [1]
- October 1
- Saint Damasus I begins his reign as Catholic Pope. [1]
374
- February 16
- Ninth recorded perihelion passage of Halley's Comet. [1]
- April 1
- Halley's Comet approaches within 0.0884 astronomical units (AUs) of Earth. [1]
378
- August 9
- Battle of Adrianople, Visigoth Calvary defeats Roman Army. [1]
379
- January 1
- Basilius the Great of Caesarea, saint (Moralia), dies. [1]
- January 19
- Theodosius installed as co-emperor of East Roman Empire. [1]
384
- May 13
- Servatius/Aravatius, bishop of Tongeren, dies at age 65+. [1]
- December 11
- Saint Damasus I ends his reign as Catholic Pope. [1]
385
- February 11
- Oldest Pope elected; Siricius - bishop of Tarragona. [1]
387
- April 18
- Bishop Ambrosius of Milan baptizes Augustinus. [1]
390
- December 25
- Roman emperor Theodosius admits debt on mass murder in Thessalonica. [1]
392
- May 15
- Valentinianus II, emperor of Rome (375-392), murdered at age 21. [1]
394
-
- Esmet-Akhom, member of Esmet priestly family, makes last known hieroglyphic inscription, in the Gate of Hadrian at Philae in Egypt. [1617.31]
395
- January 17
- Theodosius I the Great, Spanish emperor of Rome, dies at age 49. [1]
397
- April 4
- Ambrosius, Governor of Liguria/bishop of Milan (374-97)/saint, dies. [1]
399
- November 26
- Saint Siricius ends his reign as Catholic Pope. [1]
- November 27
- Saint Anastasius I begins his reign as Catholic Pope. [1]
401
- December 19
- Anastasius I, Bishop of Rome (399-401), dies. [1]
- Saint Anastasius I ends his reign as Catholic Pope. [1]
- December 22
- Saint Innocent I begins his reign as Catholic Pope. [1]
402
- April 6
- Battle at Pollentia; Roman army under Stilicho beats Visigoten. [1]
404
- January 1
- Last gladiator competition in Rome. [1]
- Telemachus, Roman monk, murdered. [1]
406
- December 31
- 80,000 Vandels attack the Rhine at Mainz. [1]
- Godagisel, king of the Vandals, dies in battle. [1]
410
- August 14
- August 24
- Rome overrun by Visigoths, symbolized fall of Western Roman Empire. [1]
414
- January 1
- King Ataulf of Narbonne marries emperor Honorius' sister Galle Placidia. [1]
417
- March 11
- Zosimus becomes bishop of Rome. [1]
- March 12
- Saint Innocent I dies, ending his reign as Catholic Pope. [1]
- March 18
- Saint Zosimus begins his reign as Catholic Pope. [1]
418
- March 10
- Jews are excluded from public office in the Roman Empire. [1]
- December 26
- Saint Zosimus ends his reign as Catholic Pope. [1]
- December 28
- Saint Boniface I begins his reign as Catholic Pope. [1]
421
- February 8
- Flavius Constantine becomes emperor Constantine III of West Roman empire. [1]
- March 25
- City of Venice is founded. [1] [1182.37]
422
- September 4
- Saint Boniface I ends his reign as Catholic Pope. [1]
- September 10
- Saint Celestine I begins his reign as Catholic Pope. [1]
425
- October 23
- Valentinian III is proclaimed ruler of the Western Roman Empire. [1033.59]
429
- January 16
- Honoratius of Arles, bishop/saint, dies. [1]
431
- June 22
- Council of Ephesus (third ecumenical council) opens. [1]
432
- March 17
- Saint Patrick, a bishop, is carried off to Ireland as a slave. [1]
- July 27
- Saint Celestine I ends his reign as Catholic Pope. [1]
- July 31
- Saint Sixtus III begins his reign as Catholic Pope. [1]
440
- August 19
- Saint Sixtus III ends his reign as Catholic Pope. [1]
450
- December 3
- Petrus Chrysologus, first archbishop of Ravenna, dies. [1]
451
- April 7
- Attila's Hun's plunder Metz. [1]
- June 24
- Tenth recorded perihelion passage of Halley's Comet. [1]
- October 8
- Council of Chalcedon (fourth ecumenical council) opens. [1]
452
- June 8
- Italy invaded by Attila the Hun. [1]
455
- March 17
- Roman senator Petronius Maximus becomes Emperor. [1]
- May 31
- Petronius Maximus, senator/Emperor of Rome, lynched. [1]
- June 2
- Gaiseric and the Vandals sack Rome. [1]
461
- March 17
- (according to legend) Patrick, Christian missionary, bishop and apostle of Ireland, dies at Saul, Downpatrick, Ireland. [1] [129]
- November 10
- Saint Leo I ends his reign as Catholic Pope. [1]
- November 19
- Saint Hilary begins his reign as Catholic Pope. [1]
463
- July 16
- Start of Lunar Cycle of Hilarius. [1]
468
- February 29
- Saint Hilary [Pope Hilarius], Catholic Pope (461-468), dies. [1]
- March 3
- Saint Simplicius elected to succeed Catholic Pope Hilarius. [1]
- December 18
- Huna Mari bar Mar Zutra rabbi, executed in Pumpedita. [1]
474
- February 3
- Leo I, Byzantine Emperor (457-74), dies. [1]
475
- January 9
- Emperor Zeno is driven from Constantinople. [1033.61]
476
-
- A meteor strike is recorded in I-hsi and Chin-ling, China. [521]
- September 4
- Romulus Augustulus, last Roman emperor in west, is deposed. [1]
482
- January 8
- Severinus, German monastery founder/saint, dies. [1]
483
- March 10
- Simplicius, Italian Pope (468-83), dies. [1]
- March 13
- Saint Felix III begins his reign as Catholic Pope. [1]
485
- April 17
- Proclus, Greek mathematician, dies in Athens. [1]
492
- March 1
- Saint Felix III ends his reign as Catholic Pope. [1]
- Saint Gelasius I begins his reign as Catholic Pope. [1]
493
- March 15
- Ostrogoten King Theodorik the Great defeats Odoaker of Italy. [1]
- Odoaker, German army leader/King of Italy (476-493), dies. [1]
496
- November 21
- Saint Gelasius I ends his reign as Catholic Pope. [1]
- November 24
- Anastasius II begins his reign as Catholic Pope. [1]
498
- November 19
- Anastasius II ends his reign as Catholic Pope. [1]
- November 22
- Saint Symmachus begins his reign as Catholic Pope. [1]
- December 25
- French king Clovis baptises himself. [1]
502
- March 29
- Bourgundy King Gundobar delegates royal power. [1]
506
- February 2
- King Alarik II of Visigoten delegates Lex Romania Visigothorum out. [1]
512
- June 29
- A monastic chronicler in Ireland records a solar eclipse. [5]
514
- July 19
- Saint Symmachus ends his reign as Catholic Pope. [1]
- July 20
- Saint Hormisdas begins his reign as Catholic Pope. [1]
523
- May 6
- Thrasamunde king of Vandalen. [1]
- August 6
- Saint Hormisdas ends his reign as Catholic Pope. [1]
- August 13
- Saint John I begins his reign as Catholic Pope. [1]
526
- May 18
- Saint John I dies, ending his reign as Catholic Pope. [1]
- May 20
- Earthquake kills 250,000 in Antioch, Byzantium (Syria). [1] [521]
- July 12
- Saint Felix IV begins his reign as Catholic Pope. [1]
527
- April 1
- Flavius Anicius Justinianus becomes compassionate emperor of Byzantium. [1] [344.10]
530
- September 17
- Boniface II is elected Pope. [697.176]
- September 22
- Saint Felix IV ends his reign as Catholic Pope. [1]
- Boniface II is consecrated as Catholic Pope in Basilica of Jilius. [1] [697.177]
- Discorus is consecrated as Catholic Pope in the Lateran. [1] [697.177]
- October 14
- Death of Catholic Pope Discorus. [1] [697.177]
532
- January 11
- Nika-revolt against Justianus and Theodora in Hippodrome Constantinople. [1]
- January 18
- Nika uprising at Constantinople fails, 30-40,000 die. [1]
- July 19
- Start of Dionysian Pascal Cycle. [1]
- October 17
- Death of Catholic pope Boniface II. [1] [697.176]
533
- January 2
- John II begins his reign as Catholic Pope. [1]
- January 13
- Remigius van Reims, first bishop of Reims (459-533)/saint, dies about 96. [1]
535
- April 30
- Amalaswintha, queen of Ostrogoten, murdered. [1]
- May 8
- John II ends his reign as Catholic Pope. [1]
- May 13
- Saint Agapitus I begins his reign as Catholic Pope. [1]
536
- April 22
- Saint Agapitus I ends his reign as Catholic Pope. [1]
- June 8
- Saint Silverius begins his reign as Catholic Pope. [1]
- (month unknown)
- The sky darkens for about 18 months, crops fail throughout Europe. Over ten years, the population of Rome drops by one-third, Constantinople by four-fifths. Environmental degradation observed from Great Britain to China. Likely cause is overhead cometary explosions. [521]
- December 9
- Byzantines Libya occupies Rome on Ostrogoten. [1]
537
- March 2
- Goths with an army ten times the size of Roman general Belisarius lay siege to Rome. [1396.18]
- November 11
- Saint Silverius ends his reign as Catholic Pope. [1]
- December 27
- Saint Sofia, church in Constantinople, initiated. [1]
540
-
- In Yemen, the Great Dam of Marib, dating from around the 7th century BCE, breaks and begins to collapse. [521]
- Athens is struck by a plague. [1612.71]
552
- July 10
- Origin of Armenian calendar. [1] (July 7 [1027.7])
553
- May 5
- Second Council of Constantinople (fifth ecumenical council) opens. [1]
555
- June 7
- Vigilius ends his reign as Catholic Pope. [1]
556
- February 21
- Maximianus van Ravenna, bishop (Basilica S Stefano), dies. [1]
- April 16
- Pelagius I begins his reign as Catholic Pope. [1]
558
- May 7
- The dome of the Hagia Sophia collapses. [1674.27]
- December 23
- Childebert, king of France (511-58), dies at about age 62. [1]
561
- March 3
- Pelagius I ends his reign as Catholic Pope. [1]
- July 17
- John III begins his reign as Catholic Pope. [1]
565
- August 22
- Saint Columba reports seeing monster in Loch Ness. [1]
- November 14
- Death of Flavius Anicius Justinianus, Byzantine emperor (527-), at age 82. [1] [344.10]
570
- June 8
- Relgion of Islam (submission) founded in Mecca. [1]
574
- July 13
- John III ends his reign as Catholic Pope. [1]
575
- June 2
- Benedict I begins his reign as Catholic Pope. [1]
578
- September 26
- General Tiberius is made co-emperor of the Eastern Roman Empire. [345.10]
- October 5
- Death of Justin II, emperor of Eastern Roman Empire. [345.10]
579
- July 30
- Death of Catholic Pope Benedict I. [1] [5]
- November 26
- Pelagius II begins his reign as Catholic Pope. [1]
580
-
- In Louraine, a great light is seen crossing the sky, falling to Earth with a crash heard across the countryside. The city of Bordeaux is shaken by an earthquake, villages are burned down, the city of Orleans is burned in a great fire. [521]
582
- August 13
- Maurice Tiberius crowned emperor of Byzantine Empire. [548.10]
- August 14
- Death of Tiberius II Constantine, emperor of Byzantine. [548.10]
585
- April 28
- War between Lydia and Media ended by solar eclipse. [1]
588
- June 25
- In China, a "Red-colored object" is reported to fall with a "noise like thunder" and exploded, burning several houses. [521]
590
- February 7
- Pelagius II Gothic Pope (579-90), dies from plague. [1]
- September 3
- Saint Gregory I begins his reign as Catholic Pope. [1]
593
- March 28
- Guntram, French king in Burgundy, dies at about age 67. [1]
597
- December 25
- England adopts Julian calendar. [1]
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