sentences:  The original design of the latter building was subsequently lengthened.In the 14th century, the two basilicas were joined by means of the demolition of one nave of either basilica and the construction of a simple asymmetrical façade, dominated by a delicately worked Gothic rose window, as ornate as the new bell tower, using the Romanesque debris stones found on the site and friezes of arms.The Chapel of Saint Charles Borromeo serves as the burial chapel for the family of the Carlist claimants to the throne of Spain.