The Complete Works of St. Ambrose. Illustrated : On the Christian Faith, On the Holy Spirit, On the Mysteries, Letters and others

Saint Ambrose, also known as Aurelius Ambrosius, is one of the four original doctors of the Church. He was the Bishop of Milan and became one of the most important theological figure of the 4th century. He is considered a saint by the Catholic Church, Eastern Orthodox Church, Anglican Communion, an