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270 CE 280 CE 290 CE 300 CE 310 CE 320 CE 330 CE
272 CE: Possible year of Emperor Constantine's birth.
306 CE: Constantius the Pale (father of Constantine I ) dies.
308 CE: Constantine I named "caesar" of the west.
312 CE: Constantine defeats Maxentius at Milvian Bridge.
312 CE: Constantine I disbands the Praetorian Guard.
312 CE: Constantine I reduces the cohortes urbanae of Rome.
313 CE: Roman emperor Constantine I tolerates Christianity.
313 CE: The Edict of Milan enacted by Constantine I.
313 CE: The Basilica of Maxentius & Constantine is completed in Rome's Forum Romanum.
315 CE: Arch of Constantine I built in Rome to commemorate victory over Maxentius in 312 CE.
315 CE: The Baths of Constantine I in Rome are completed.
324 CE: Constantine I defeats Licinius at Chrysopolis.
325 CE: Roman Emperor Constantine I calls the Council of Nicaea.
330 CE: Constantinople is founded on the site of old Byzantium as “the new Rome.”
337 CE: Death of Emperor Constantine I.