Chronyas has 653 events dated to the 4th century (301 to 400 CE), during the Ancient civilizations. Below are the most notable ones, in date order.
Most of the events in this century belong to Wars, politics & history and Civilizations & archaeology.
Open this century on the timeline
- c. 301 CEOrigins of San Marino
- 303 CEConstruction of Etchmiadzin Cathedral
- 23 February 303 CEThe Great Persecution of Christians begins
- from 24 February 303 CE to 1 January 313 CEDiocletianic Persecution
- from 304 CE to 439 CEWu Hu luan hua
- from 304 CE to 439 CESixteen Kingdoms
- 1 May 305 CEConstantius Chlorus becomes Roman emperor
- 1 May 305 CEGalerius becomes Roman emperor
- 306 CESynod of Elvira
- 25 July 306 CEConstantine the Great becomes Roman emperor
- 28 October 306 CEMaxentius becomes Roman emperor
- 308 CEMarcellus I becomes Pope
- 11 November 308 CELicinius becomes Roman emperor
- 309 CEShapur II becomes Emperor of the Sasanian Empire
- 309 CEOrigins of Temple of Romulus
- 18 April 309 CEEusebius becomes Pope
- c. 310 CEEruption of Witori
- 2 July 311 CEMiltiades becomes Pope
- 312 CEOrigins of Basilica of Maxentius
- 28 October 312 CEBattle of the Milvian Bridge
- June 313 CEEdict of Milan
- 31 January 314 CESylvester I becomes Pope
- 25 July 315 CEConstruction of Arch of Constantine
- from 320 CE to 550 CEGupta Empire
- 325 CEFirst Council of Nicaea
- 327 CEConstruction of Church of the Nativity
- from 330 CE to 555 CERouran Khaganate
- c. 330 CEOrigins of Constantinople
- c. 330 CEKing Ezana converts Aksum to Christianity
- 11 May 330 CEConstantine dedicates Constantinople
- 17 November 331 CEBirth of Julian
- 335 CEConstruction of Church of the Holy Sepulchre
- 19 January 336 CEMark becomes Pope
- 7 February 337 CEJulius I becomes Pope
- 22 May 337 CEConstantius II becomes Roman emperor
- 22 May 337 CEConstantine II becomes Roman emperor
- 22 May 337 CEDeath of Constantine the Great
- 339 CEBirth of Ambrose
- c. 340 CEEruption of Akutan
- 341 CEEarthquake in Antakya (Antioch); Cyprus (Salamis), Turkey
- 344 CEBattle of Singara
- 345 CEBirth of Jerome
- 11 January 347 CEBirth of Theodosius I
- 349 CEBirth of John Chrysostom
- from 350 CE to 1000Western Ganga dynasty
- 17 May 352 CELiberius becomes Pope
- 13 November 354 CEBirth of Augustine of Hippo
- 360 CEBirth of Hypatia
- February 360 CEJulian becomes Roman emperor
- from March 363 CE to July 363 CEJulian's Persian expedition
- June 363 CEDriving car
- 26 June 363 CEJovian becomes Roman emperor
- 28 June 363 CEJovian becomes Byzantine emperor
- 26 February 364 CEValentinian I becomes Roman emperor
- 28 March 364 CEValens becomes Roman emperor
- 21 July 365 CE365 Crete earthquake
- 1 October 366 CEDamasus I becomes Pope
- 4 August 367 CEGratian becomes Roman emperor
- 11 October 367 CEEarthquake in Iznik,Nicaea, Turkey
- 371 CEBattle of Bagavan
- from 375 CE to 568 CEMigration Period
- from 376 CE to 382 CEGothic War of 376–382
- 9 August 378 CEBattle of Adrianople
- 9 August 378 CEThe Goths destroy a Roman army at Adrianople
- 19 January 379 CETheodosius I becomes Roman emperor
- 27 February 380 CEChristianity becomes the state religion of Rome
- 381 CEFirst Council of Constantinople
- December 384 CESiricius becomes Pope
- 386 CEOrigins of Sümela Monastery
- 386 CEConstruction of Basilica of Saint Paul outside the Walls
- from 386 CE to 535 CENorthern Wei
- 23 January 393 CEHonorius becomes Western Roman emperor
- from 5 September 394 CE to 6 September 394 CEBattle of the Frigidus
- 395 CEAlaric I becomes King of Wisigoths
- 17 January 395 CEArcadius becomes Byzantine emperor
- 17 January 395 CEThe Roman Empire is permanently divided
- 399 CEThe monk Faxian sets out for India
- 27 November 399 CEAnastasius I becomes Pope
- from 400 CE to 700 CEMigration Period Pessimum
- c. 400 CEBirth of Leo I