Fridianus (Frediano) was an Irish bishop of Lucca in the first half of the 6th century. He had a church built on this spot, dedicated to St. Vincent, a martyr from Zaragoza, Spain. When Fridianus was buried in this church, the church was renamed Ss. Frediano and Vincenzo. Soon afterwards, a community of Augustinian canons was growing around this church. In the Longobard era, the church and the canon house were enlarged. In 1104, this order was recognized by Pope Paschal II. The prior of St. Frediano was later accorded a rank equal in dignity to that of a bishop.