Aurelius Ambrosius, better known in English as Saint Ambrose (c. 340 - 4 April 397), was an archbishop of Milan who became one of the most influential ecclesiastical figures of the 4th century. He was one of the four original doctors of the Church. He is patron saint of Milan. On the eve of setting out for the East, to aid his uncle Valens in repelling a Gothic invasion, Gratian, the Emperor of the West, requested St. Ambrose to write him a treatise in proof of the Divinity of Jesus Christ. Gratian's object in making this request was to secure some sort of preservative against the corrupting...