378–380
Latin
On the Faith
De Fide
Ambrose of Milan · c. 339 – 397
Written at the request of the young emperor Gratian, who was leaving for a war against the Goths and asked his bishop for an account of the faith he was defending. Ambrose supplies a defence of the Son's full divinity and, in the later books, a good deal of advice the emperor had not asked for.