Roman Battles in the 4th century AD

• 312 -
• Battle of Turin - Constantine I defeats forces loyal to Maxentius.
• Battle of Verona - Constantine I defeats more forces loyal to Maxentius.
• 28 October - Battle of Milvian Bridge - Constantine I defeats Maxentius and takes control of Italy.
• 313, 30 October - Battle of Tzirallum - In the eastern part of the Empire, the forces of Licinius defeat Maximinus.
• 314, 8 October - Battle of Cibalae - Constantine defeats Licinius
• 316 - Battle of Mardia - Constantine again defeats Licinius, who cedes Illyricum to Constantine.
• 324 -
• 3 July - Battle of Adrianople - Constantine defeats Licinius, who flees to Byzantium
• July - Battle of the Hellespont - Flavius Julius Crispus, son of Constantine, defeats the naval forces of Licinius
• 18 September - Battle of Chrysopolis - Constantine decisively defeats Licinius, establishing his sole control over the empire.
• 344 - Battle of Singara - Emperor Constantius II fights an indecisive battle against King Shapur II of Persia (approximate date)
• 351 - Battle of Mursa Major - Emperor Constantius II defeats the usurper Magnentius
• 353 - Battle of Mons Seleucus - Final defeat of Magnentius by Constantius II
• 356 - Battle of Reims - Caesar Julian is defeated by the Alamanni