1. Valerius Licinianus Licinius was Roman emperor from 308 to 324.

1. Valerius Licinianus Licinius was Roman emperor from 308 to 324.
Licinius was trusted enough by Galerius that in 307 he was sent as an envoy to Italy, to attempt to reach some sort of agreement with the usurper Maxentius.
Licinius moved to Heraclea, which he captured after a short siege, before moving his forces to the first posting station.
Licinius' army broke through and Daza retreated to Tarsus, where Licinius continued to press him on land and sea.
Licinius sought out and killed multiple relatives of the Tetrarchs - Daza's wife and two children, Severus' son Flavius Severianus, Galerius' son Candidianus, Diocletian's wife Prisca, and Galeria Valeria, daughter of Diocletian and wife of Galerius.
The next year a new war erupted, when Licinius named Valerius Valens co-emperor, only for Licinius to suffer a humiliating defeat on the plains in the Battle of Mardia in Thrace.
The emperors were reconciled after these two battles and Licinius had his co-emperor Valens killed.
Licinius kept himself busy with a campaign against the Sarmatians in 318, but temperatures rose again in 321 when Constantine pursued some Sarmatians, who had been ravaging some territory in his realm, across the Danube into what was technically Licinius's territory.
When he repeated this with another invasion, this time by the Goths who were pillaging Thrace under their leader Rausimod, Licinius complained that Constantine had broken the treaty between them.
Licinius co-authored the Edict of Milan which ended the Great Persecution, and re-affirmed the rights of Christians in his half of the empire.
Licinius added the Christian symbol to his armies, and attempted to regulate the affairs of the Church hierarchy just as Constantine and his successors were to do.