Ambrose of Milan (; 4 April 397), venerated as Saint Ambrose, was a theologian and statesman who served as
Bishop of Milan from 374 to 397. He expressed himself prominently as a public figure, fiercely promoting
Roman Christianity against
Arianism
Arianism (, ) is a Christology, Christological doctrine which rejects the traditional notion of the Trinity and considers Jesus to be a creation of God, and therefore distinct from God. It is named after its major proponent, Arius (). It is co ...
and
paganism
Paganism (, later 'civilian') is a term first used in the fourth century by early Christians for people in the Roman Empire who practiced polytheism, or ethnic religions other than Christianity, Judaism, and Samaritanism. In the time of the ...
. He left a substantial collection of writings, of which the best known include the ethical commentary ''De officiis ministrorum'' (377–391), and the
exegetical (386–390). His preaching, his actions and his literary works, in addition to his innovative musical hymnography, made him one of the most influential