Gaius Galerius Valerius Maximianus was Roman emperor from 305 to 311. He participated in the system of government later known as the Tetrarchy, first acting as caesar under Emperor Diocletian. In this
Likely bust of Galerius in porphyry, found in 1993 at Gamzigrad and held at the National Museum [sr] in Zaječar, Serbia.
Diocletian, Galerius's father-in-law and senior emperor
Detail of Galerius attacking Narseh on the Arch of Galerius at Thessaloniki, Greece, the city where Galerius carried out most of his administrative actions.
Aureus of Galerius as Caesar. The reverse depicts the god Jupiter.
The civil wars of the Tetrarchy were a series of conflicts between the co-emperors of the Roman Empire, starting from 306 AD with the usurpation of Maxentius and the defeat of Severus, and ending with
Constantine at the battle of the Milvian Bridge, fresco by Raphael, Vatican Rooms.
The emperor Diocletian, who established the Tetrarchy.
The Battle of the Milvian Bridge saw the death of Maxentius in 312 AD.