WordNet (r) 3.0 (2006):

St. Ambrose
    n 1: (Roman Catholic Church) Roman priest who became bishop of
         Milan; the first Church Father born and raised in the
         Christian faith; composer of hymns; imposed orthodoxy on
         the early Christian church and built up its secular power;
         a saint and Doctor of the Church (340?-397) [syn:
         Ambrose, Saint Ambrose, St. Ambrose]