 Vaulted chapels were added at the beginning of the 16th century and more alterations followed in the 17th and 18th centuries.The choir and apse were also reconstructed at the beginning of the 16th century, and the five square apsidal chapels were completed.The ambulatory was created in 1600 by introducing ten cylindrical piers, and the carved early 17th century choir stalls were placed here in the 19th century.