Урбан VI
The Collegiate Church of San Martino (; "Duomo di Pietrasanta") is a collegiate church in Pietrasanta, in the region of Tuscany, Italy. It is the main church or "duomo" of the town. It is first mentioned in 1223, and was subsequently enlarged in 1330 and in 1387 when Pope Urban VI had a baptismal font installed in the church.