Colletta, Pietro, Teofilo De Angelis, and Fulvio Delle Donne, eds. The Kingdom of Sicily During the Norman and Swabian Age: Forms and Organization of Culture and Politics. Vol. 6. BUP - Mediterranean Worlds. SHARE Books, 2021. Accessed October 11, 2026. https://www.fedoabooks.unina.it/index.php/fedoapress/catalog/book/239.