The Castillo de la Mota (English: Castle of the Butte) was a formidable fortress-turned-prison in existence during the turn of the 15th century. It was situated in the region of Aragon, Spain, where it dominated the plateau, or butte, it was situated on. Originally constructed to defend the region from Moorish advances, a small town grew to surround the castle, which in turn enveloped the village in an outer wall.
From 1504 to 1506, following his attempted escape from the Castel Sant'Angelo, the Castillo de la Mota acted as a prison for Cesare Borgia. Cesare's location was kept a closely guarded secret between Pope Julius II and King Ferdinand II of Aragon; not even the Mentor of the Italian Assassins – Ezio Auditore – was allowed to know of Cesare's whereabouts.
Eventually, Cesare escaped the castle with aid of Micheletto Corella and a bribed prison guard. Having had rope smuggled in for him, Cesare climbed down from his window and snuck past the main gate in his stolen guard uniform. Not long after his escape, the Assassins Ezio Auditore, Niccolò Machiavelli and their friend Leonardo da Vinci arrived at the fortress in pursuit of Micheletto, only to learn of Cesare's escape.