The Mosque of al-Hakim (Arabic: مسجد الحاكم بأمر الله, romanized: Masjid al-Ḥākim bi Amr Allāh), nicknamed al-Anwar (Arabic: الانور, lit. 'the Illuminated'), is a historic mosque in Cairo, Egypt. It is named after Al-Hakim bi-Amr Allah (985–1021), the sixth Fatimid caliph and 16th Ismaili Imam. Construction of the mosque was originally started by Caliph al-'Aziz, the son of al-Mu'izz and the father of al Hakim, in 990 AD. It was completed in 1013 by al-Hakim, which is why it is named after him.