In the literature of Fatimid Egypt

At a time when we see some literature stating that the Fatimids established their state on an Islamic religious basis, and that the Fatimid caliphs took their lineage from their lineage to the Holy Prophet, may God bless him and grant him peace, and that the Fatimids celebrated Islamic religious holidays in a way that had not been seen before, and that they established mosques to hold prayers, and...