Ambrose (born Aurelius Ambrosius; c. 340 – 397) was the Bishop of Milan, a theologian, and one of the most influential ecclesiastical figures of the 4th century.

As bishop, he took a firm position against Arianism and attempted to mediate the conflict between the emperor Theodosius I and the usurper Magnus Maximus. Tradition credits Ambrose with promoting "antiphonal chant", a style of chanting in which one side of the choir responds alternately to the other, as well as with composing Veni redemptor gentium, an Advent hymn. He also had notable influence on Augustine of Hippo(354-430).

Western Christianity identified Ambrose as one of its four traditional Doctors of the Church. He is considered a saint by the Catholic Church, Eastern Orthodox Church, Anglican Communion, and various Lutheran denominations, and venerated as the patron saint of Milan.

Source: https://en.wikipedia.org/wiki/Ambrose

      St. Ambrose -
On the Christian Faith St. Ambrose -
On the Holy Spirit St. Ambrose -
On the Mysteries 
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On Repentance St Ambrose -
On the Duties of the Clergy