Ambrosius, Mediolanensis (Saint) Opera, edited by the Congregation of St. Maur, 8 vol., double column, vol.1 with half-title and title printed in red and black, all titles with woodcut printer's device, woodcut head-pieces and decorative initials, occasional later ink marginalia, some foxing or staining, lightly browned, contemporary mottled calf, gilt spines in compartments and with red morocco labels (a few chipped with loss), vol.1 lacking label, some spine ends and corners worn, spines scuffed, rubbed, 4to, Venice, Francesco Pitteri, 1781-1782.*** Rare set in commerce of this important edition, edited by the renowned French Benedictine scholars of the Congregation of St. Maur.