Saint Gregory's Commentary on Job, or Moralia, sive Expositio in Job, sometimes called Magna Moralia, but not to be confused with Aristotle's Great Ethics known by the same title, 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 volumes, a commentary on the book of Job entitled "An Extensive Consideration of Moral Questions".