Constantine the Great
In 308 Constantine fought a war against the Bructeri. In November 308, the emperors Diocletian, Maximian, and Galerius met at Carnutum (Petronell-Carnuntum, Austria) and agreed that Constantine was a caesar. Constantine himself continued to say that he was an augustus. The Latin writer Lactantius wrote that in 309, Constantine got the title in . The Roman provinces that Galerius controlled said that Constantine was Roman consul for the first time in 309, but the provinces Constantine and Maxentius controlled did not accept this.