Where was Constantine declared Emperor?

Answer 1

Answer
Constantine's father, Constantius I was Augustus, or senior emperor, jointly with Galerius. When his father died in 306, the troops in Britain hailed Constantine as Augustus, in the style of a military coup. This was not to last, as Galerius would only concede Constantine the status of Caesar, or junior emperor. A little later, Constantine managed to be declared Augustus again, but once again was forced to back down, before reclaiming the title. Finally, in one of the biggest battles of the entire fourth century, Constantine defeated his last rival, Licinius, outside Hadrianopolis and became sole emperor of Rome.