13th–17th centuries. A complex comprising several buildings: the mansion of Peralta and that of Arias de la Hoz, of which the Tower of Hercules (designated a Site of Cultural Interest) formed part; it still houses a sculpture of this mythological hero, who is credited with founding the city.

It has been a convent of the Dominican Sisters since 1513. The church was built in the 17th century, possibly by Pedro de Brizuela, with a simple façade dominated by an image of the patron saint. Religious crafts are on sale.