Constantine becomes Caesar

After fleeing Galerius, Constantine joins his father on campaign in Britain. However, his father falls sick during the campaign and dies on July 25, 306. He names Constantine his heir as Augustus, and Gaul and Britain support his rule - though Iberia, which has only recently been conquered, does not. Galerius is outraged by the news, but he is forced to compromise and grants him the title of Caesar. Constantine accepts to solidify his claim. He is granted control over Britain, Gaul, and Spain.