Castillo de Calatañazor rises within a walled medieval village in Soria, Castilla y León, its name derived from Arabic 'Qalat al-Nasur' meaning 'castle of the vulture.' The fortress dates to the 12th century with significant 14th-century reforms, featuring a rectangular floor plan with four corner towers and a keep of considerable masonry construction reaching 18 meters thick in some sections. The castle is renowned in Spanish history as the site where the legendary Moorish leader Almanzor died in 1002 while returning from campaigns in the Medinaceli region. Today in consolidated ruins, the castle preserves sections of its keep and wall structures, providing commanding views across the surrounding landscape and offering visitors a tangible connection to Spain's medieval past.