GIACOMO di Metz. - Dominican theologian and writer, born in Metz. Nothing is known of his life except that he twice commented on Peter Lombard’s *Sentences* in Paris between the late 13th and early 14th centuries. He never, however, attained the rank of master. He probably had as a pupil Durandus of Saint-Pourçain. His *Commentary on the Sentences* survives in seven manuscripts, the only complete one being in the Vatican Library (Borghese, cod. 122).
G. is a keen and consistently clear theologian; in philosophy he is Aristotelian, but in theology he is more influenced by pre-Thomistic Augustinianism than by St. Thomas Aquinas. For example, he denies the real distinction between nature and suppositum; in Trinitarian doctrine he posits a real distinction between the divine essence and the relations; original sin, in his view, is merely a *reatus poenae*; he also denies the causality of the Sacraments. All these doctrines were later taken up by Durandus. A *Correctorium* was written against him, almost certainly by Hervé of Nédellec, the foremost opponent of Durandus.