Guarnacci, Mario an Italian prelate, was born at Volterre in 1701. He received the doctor's degree at Florence, where he pursued the course of Salvini. He was honored with the favor of Benedict XIV, who charged him to continue Chazon's Lives of the Popes, but he retired in 1757 to his own country. He discovered there the remains of Roman baths. He also made a collection of Etruscan antiquities, which he bequeathed to his native city. He died August 21, 1785, leaving, Dissertazione sopra le XII Tavole (Florence, 1747): — Vitae et Res Gestce Pontificum Romanorum, etc. (Rome, 1751): — Origini Italiche (Volterre, 1768): — Poesie di Zelalgo Arrasiona (Lucca, 1769). See Hoefer, Nouv. Biog. Generale, s.v.