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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] 
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] 
325
May 20
First Christian ecumenical council opens at Nicæa, 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
Constantine the Great, emperor of Rome (306-37)/anti semite, dies. [1]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] 
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] 
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 11
Goths lay siege to Rome. [1]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] 
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
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
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