 It was completed in 1310 although several structural modifications (including the falling of the ambulatory and the construction of a new choir screen) took place between the end of the 14th and the mid-15th century.The Saint, according to his will, had been buried in the small church of "Santa Maria Mater Domini", probably dating from the late 12th century and near which a convent was founded by him in 1229.This church was incorporated into the present basilica as the "Cappella della Madonna Mora" (Chapel of the Dark Madonna).