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Ambrose of Milan (Latin: Aurelius Ambrosius; c. 339 – 4 April 397), canonized as Saint Ambrose, was a theologian and statesman who served as Bishop of Milan from 374 to 397. Ambrose was serving as the Roman governor of Aemilia-Liguria in Milan when he was unexpectedly made Bishop of Milan in 374 by popular acclamation. As bishop, he took a firm position against Arianism and attempted to mediate the conflict between the emperors Theodosius I and Magnus Maximus. He also left a substantial collection of writings, of which the best known include the ethical commentary De officiis ministrorum (377–391), and the exegetical Exameron (386–390). His preaching, his actions, and his literary works made him one of the most influential ecclesiastical figures of the 4th century.