Ambrose of Milan (AD 339–397), also called St. Ambrose, was the first early church father to be born into a Roman Christian family. He is best remembered for his successful fight against Arianism, his contributions to church music, his stance on the separation of church and state, and his mentorship of the church father Augustine. Long after his death, Ambrose would be named a “doctor of the church” in the Catholic Church along with others such as Augustine, Pope Gregory, and Jerome.