sentences:  The Catholic Monarchs started the construction of the Royal Palace of Aranjuez.In the 16th century, San Lorenzo de El Escorial was built and became another royal site of the province.The town of Madrid, which was one of the eighteen cities with the right to vote in the Cortes of Castile, was seat of the Courts themselves on several occasions and was the residence of several monarchs, amongst them the emperor Charles I who reformed and expanded the "Alcázar" or Castle of the city.