306 CE - Constantine started to reign.
311 CE – The Edict of Toleration by Galerius was issued in 311 by the Roman Tetrarchy of Galerius, Constantine and Licinius, officially ending the Diocletian persecution of Christianity.
313 CE - Constantine published the "Edict of Toleration" which made Christianity a legal and official religion within the Roman Empire.
313 CE – Roman Emperors Constantine and Licinius issued the Edict of Milan that legalized Christianity across the whole Empire.
Note: Lincinius was a Roman emperor from 308 to 324. He was defeated at the Battle of Chrysopolis (324 CE). Lincinius was then executed on the orders of Constantine.
In 324CE Constantine became the sole ruler. The council of Nicea was formed by the Emperor Constantine. Constantine was Roman Emperor from 306 to 337 (Constantine died 337 C.E.).
In 381 C.E., the Council of Constantinople was formed. In 382CE only four of the gospels were chosen for this stated reason:
"There were four winds, four points of the compass, four corners of the temple"; and ordered the remaining writings to be destroyed by the Roman Empire. The choices were made by the tried and tested democratic method of holding a ballot (i.e., stacked voting).