THESAURUS SACRORUM RITUUM, SEV COMMENTARIA IN RUBRICAS MISSALIS ET BREVIARII ROMANI, . INQUIBUS ORIGO CUIUSQUE RITUS, CAUSAE HISTORICAE, VEL MYSTICAE, EX MAIORUM INGENIO THEORIA, PRAXIS, OBLIGATIO, & EXQUISITUS USUS. ADDITIS OPPORTUN?à DECRETIS OMNIBUS S. RITUUM CONGREG. QU?ÄM BREVISSIM?à EXPLICANTUR; AB AUTHORE RECOGNITA, IN HAC ULTIM?Ç EDITIONE VARI?à LOCUPLETATA, & AB INNUMERIS MENDIS EXPURGATA. APPENDICES DABIT PAGINA SEQUENS. CUM SEPTEM INDICIBUS.

1672, Lyon, Petri Chevalier, 4to, two volumes, pp [xxiv], 308, [xxviii]; [xxiv], 328; bound with: ENCHIRIDION, SEV MANUALE EPISCOPORUM, PRO DECRETIS IN VISITATIONE & SYNODO DE QUAC UMQUE RE CONDENDIS. IN QUA DECRETA CONCILII TRIDENTINI, BULLARII, PONTIFICII, SACRARUM CONGREGATIONUM ROMANARUM, CONCILIORUM SEPTEM PROVINCIALIUM MEDIOLANENSIUM, TUM EA UNIVERSA QUAE DE OFFICIO & POTESTAE EPISCOPI ?Ä QUIBUSCUMQUE PROBATIS AUCTORIBUS TRADITA FUERUNT, PER QUASI APHORISMOS, EXQUISITA METHODO COPIOSA, & BREVI CONTINENTUR. 1672, Lyon, Petri Chevalier, in via Mercatoria, 4to, two volumes, pp [viii], 284; 117, [ii], full blind-stamped contemporary vellum over oak boards, vellum straps and clasps, lettered in ink on spine. Gavanto was an Italian priest who devoted his life to liturgical studies, and was widely recognised as an expert on ancient sacred rites. Some foxing and some worm-tracking to the inner margins.