Constantine the Great
In 310, probably on the 1 May, Galerius made Maximinus Daza augustus. From this time, the whole empire started to agree that Constantine was an augustus as well. In summer 310, Constantine again fought a military campaign against the Franks. A war between Constantine and Maximian began. Maximian was at Massilia (Marseille, France) when Constantine took control of the city, probably in around July 310. Then Maximian died, probably by suicide.