Peñafiel Castle is located in Peñafiel, Valladolid Province, Spain. The castle is more than 200 metres (660 ft) long and encloses an area about 35 m (115 ft) wide. Standing in the middle is a 34 m (112 ft) high three-storey keep.
Fernan Gonzalez began construction on the Peñafiel site in 947, as a frontier outpost in defence against the Arabs. A castle was built in 1013 by Sancho Garcia to protect the land. Several other members of the Spanish nobility added to the castle including Juan Manuel and Pedro Girón. Blanche I, Queen of Navarre gave birth to the Charles, Prince of Viana in the keep of Peñafiel in 1421