The Trenta chapel in the left aisle houses the polyptych of the Virgin and the Child, a 15th-century masterpiece by Jacopo della Quercia, carved with the help of his assistant Giovanni da Imola. Below the altar is a Roman sarcophagus with the body of St Richard the Pilgrim, an English “king” (of Wessex), who died in Lucca in 722 while on pilgrimage to Rome. He was the father of Saints Willibald, Winibald and Walpurga. On the marble floor lies a tombstone of Lorenzo Trenta and his wife, equally from the hand of Jacopo della Quercia.