Saint Gregory's
Commentary on Job, or
Moralia, sive Expositio in Job, sometimes called
Magna Moralia (not to be confused with
Aristotle's
Magna Moralia), was written between 578 and 595, begun when Gregory was at the court of
Tiberius II at
Constantinople, but finished only after he had already been in
Rome for several years. It is Gregory's major work, filling some 35 books or 6 volumes, a commentary on the
Book of Job entitled "An Extensive Consideration of Moral Questions".