The Hafizi was a branch of Mustaali Ismailism that believed the current ruler of the Fatimid Caliphate after the reign of Al-Amir Bi-Ahkamillah, Al-Hafiz was also the Imam of the Time as well as his descendants. The Hafizi sect disappeared completely after the collapse of the Fatimid Caliphate in 567 AH/1171 CE as they joined the Taiyabi sect.
Al-Hafiz is the son of Abul Qasim Muhammad a son of Al Mustansirbillah and an uncle of Al Musta'alibillah.
The Hafizi sect lived on into the 14th century AD with adherents in Northern Egypt and Syria but had died out by the 15th century AD.