WordNet (r) 3.0 (2006):

Theodosius
    n 1: the last emperor of a united Roman Empire, he took control
         of the eastern empire and ended the war with the Visigoths;
         he became a Christian and in 391 banned all forms of pagan
         worship (346-395) [syn: Theodosius, Theodosius I,
         Theodosius the Great, Flavius Theodosius]