CONSTANTINE the GREAT
Constantine the Great (272-337 AD). First Roman emperor to convert to Christianity. Constantine and co-emperor Licinius issued the Edict of Milan, which allowed religious freedom in the empire. He won the civil wars against Maxentius and Licinius. He moved to Byzantium, which he named New Rome. This location was later named Constantinople in his honor.
Constantius II was the 61st Roman Emperor. After Constans defeated Constantine II, Constans ruled the west, and Constantius ruled the east. In 305 Constans was assassinated by a usurper, Magnentius. Constantius defeated Magnentius, becoming the sole ruler. Later, Constantius elevated his cousin Constantius Gallus to the rank of Caesar, but executed him three years later. In 355, Constantius made Gallus' younger brother, Julian, Caesar. Constantius died in 362.
Constantine II, the 60th Roman Emperor, reigned from from 337 to 340. He was co-emperor alongside his brothers Constantius II and Constans in an empire again divided into sections, one for each brother. The sons of Constantine the Great, however, soon became rivals for power. Constantine II was killed by forces of his youngest brother, Constans, in 240. Constans then claimed the lands previously ruled by Constantine I.