[PATIRICIUS PICCOLOMINEUS, Augustinius] Rituum Ecclesiasticorum sive Sacrarum Cerimoniarum, edited by Christophe Marcellus, Venice: G. de Gregoriis, 21st November 1516. 2°, privilege of Pope Leo X on verso of title and dedication to the same on verso of leaf vi, 3 woodcut illustrations (title creased and lightly browned with minor worming affecting a few letters, occasional mainly marginal spotting and staining, last few leaves stained more heavily), later paper-covered boards (inner hinges broken, rubbed and lightly stained), contemporary inscription on title. FIRST EDITION. Adams L976; Brunet III, 1396.