Arkush (Sp. Arcos) is a frequently recurring toponym on the Iberian Peninsula. Examples of places bearing this name include Arcos (Burgos), Los Arcos (Navarra), Arcos de la Polvorosa (Zamora), and in the territory which was al-Andalus, Arcos de la Sierra (Cuenca), Arcos de las Salinas (Teruel), Arcos de Jalón (Soria)-which still preserves ruins of its Arab fortress. But Arkush in Arabic sources refers specifically to Arcos de la Frontera, the border area between Castile and Granada from the seventh/thirteenth to the ninth/fifteenth century, which today is