At the site that once held the house of the noble Vargas family, where Saint Isidore and his wife Maria worked as servants, little remains—only an old well built in the 12th century. Archaeological investigations between 1989 and 1997 had revealed the floor of the building, a cemetery, and this well, which held Spanish-Muslim pottery from the 10th and 11th centuries. Today it is a part of the Saint Isidore Museum, which covers the city’s deep history. Legend has it that one day, while Isidore worked in the fields, Mary was taking care…