In 1614 the Laurentina was enriched with the entire library of Muley Zidan, Sultan of Morocco.For more information of this period of acquisition of Arab collections, see the chapter "Formación del fondo árabe moderno" in JUSTEL CALABOZO, B., La Real Biblioteca..., p. 133-170. In total, 3975 books were revised and classified, and preserved in addition to the existing collection. In 1651, when the Sultan of Morocco asked for the return of his library, he was refused.
