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Val·en·tin·ian I(văl′ən-tĭn′ē-ən, -tĭn′yən) ad 321-375.
Emperor of Rome in the West (364-375) who ruled jointly with his brother Valens in the East. He led numerous military campaigns in Africa and Europe.
Valentinian I(ˌvælənˈtɪnɪən) or
(Biography) 321–375 ad, emperor of the Western Roman Empire (364–375); appointed his brother Valens to rule the Eastern Empire