Topic summary
Western Empire
Extracted from the Wikipedia article Western Roman Empire.
Tetrarchy (286–313)
Licinius was made emperor of the Eastern Empire, and parts of the Western Empire, all of which was actually held by Maxentius, at the Council of Carnuntum, which was held in 308 in order to try to end the civil war in the Western Empire. Constantine invaded Licinius' section of the Western Empire in 313, and forced him to sign a treaty in which he forfeited his claim to the Western Empire, and only controlled the Eastern Empire. Licinius attempted twice to replace Constantine, first with Valerius Valens in 316 and then Martinian in 324, but they were both killed shortly after their elevation.