The Aljaferia is the most important civil building in the history of Zaragoza. It was a muslim palace for the monarch Abu-Yafar during the XI century (Aljaferia means "the house of Abu-Yafar"). Later, after the Reconquest, it was enlarged and it became a christian palace. The new lounges were built in the mudejar style. "Mudejar" was the word used for the muslims that were allowed to live in the reconquered territories; many of them were cheap labor in the construction of new buildings but their legacy was that the previous muslim architectonic style remained in the new christian buildings. Then, this palace became the residency of the Catholic Kings in the XV century, the seat of the Inquisition tribunal and its dungeons, a fort in XVII century and barracks in XVIII century. Today is the seat of the regional parliament.