Constantine the Great
In 324, Constantine and Crispus fought another war against their co-emperor Licinius. The Consularia Constantinopolitana says that Constantine's army overcame the army of Licinius in a battle near Hadrianopolis (Edirne, European Turkey) on 3 July 324. Constantine's armies again overcame Licinius's soldiers at the Battle of Chrysopolis. The Consularia Constantinopolitana says that this battle was on the 18 September 324. Licinius and Licinius II both retired from being emperors. On 8 November that year, Constantine made his son Constantius II caesar. At that time, all Constantine's co-emperors were Constantine's own children (the  Crispus, Constantine II, and Constantius II).