What is "al-hafiz"

Al-Ḥāfīz (c. 1076 – 8 October 1149), was the eleventh Caliph of the Fāṭimids (r. 1130–1149)

Al-Ḥāfiz assumed the caliphate as the cousin of the murdered al-Āmir (1101–1130). Since al-Āmir had not named an heir when he died, the succession of al-Ḥāfiz was not uncontested - a group of Shī‘ah recognised al-Āmir's son aṭ-Ṭayyib Abī al-Qāṣim as rightful heir, leading to a new schism. Additionally, al-Afdal Shahanshah, whose father was regent to al-Mustā‘lī before he was overthrown when al-Āmir succeeded him, challenged and jailed al-Ḥāfiz and in fact ruled for a brief while before he was assassinated, presumably by supporters of al-Ḥāfiz.