The Alcazaba is a fortress at the western tip of the Alhambra in Granada, Spain. Its name comes from the Arabic term al-qaṣabah (القصبة) literally meaning 'the citadel' or kasbah, which became Alcazaba in Spanish. It is the oldest surviving part of the Alhambra, having been built by Muhammad I Ibn al-Ahmar, the founder of the Nasrid dynasty, after 1238 CE. It stands on the site of an earlier fortress built by the Zirid kingdom of Granada in the 11th century CE.