Constantine, d. 411, Roman general. He was proclaimed emperor by the Roman troops in Britain in 407 and led a revolt in Gaul and Spain against the Western emperor Honorius. He conquered part of Gaul and, through his son Constans, took Spain. Constantine forced recognition from Honorius as joint emperor, but his triumph was short. The counterrevolt of Gerontius halted him, and he was defeated by Honorius' general Constantius (later Emperor Constantius III). Constantine was beheaded. His withdrawal of Roman troops from Britain had greatly weakened the Roman hold on that island.
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