Castillo de Arévalo is a 15th-century fortress perched on a hilltop plateau at the strategic confluence of the Adaja and Arevalillo rivers in Ávila province. The castle gained prominence as a royal prison, most notably housing King Pedro I's wife, Doña Blanca de Bourbon, during the 14th century. In 1462, King Enrique IV granted possession of the castle to Don Álvaro de Zuñiga as recognition of his loyalty. Featuring a distinctive pentagonal plan with a great Tower of the Tribute and defensive works including an advance pit, the fortress was reformed in the 16th century by the Catholic Kings to accommodate artillery warfare, incorporating characteristic Mudéjar brick construction. After centuries of abandonment and secondary uses, the Ministry of Agriculture undertook restoration in the 1950s.
