The first Christian cathedral of Saragossa, built and dedicated to San Salvador, is raised on the same space that had previously been occupied by the Roman Temple of the Forum, the Visigoth church and the Higher Moslem Mosque. At the end of the 12th. century, the new work is started following the artistic guidelines of late Romanesque,with elements that had been developed in the cathedral of Jaca. As a reflection of this first stage we preserve the lower part of the apses, which is clearly differentiated from the rest as it is made of stone compared to the later brick. The semicircular windows are closed with alabaster and have chequered motifs and storied capitals.