A very interesting possibility that I actually had failed to consider. My intention would be for the Crusaders to have the whole of Fatimid Egypt, so as to guarantee its survival, but I think that a continued relationship between the Catholic Franks and a neighboring polity of Egyptian Copts presents some fascinating possibilities.
Huh, why would the Crusaders allow a heretical state to come into existence if they could just attack and conquer it instead?
Could it be a loose vassal state instead? Like suppose a Coptic uprising happens in Upper Egypt as the Crusaders are invading the Delta, and then in order to secure victory the two groups ally. The Coptic state would be militarily weaker than the Crusader Kingdom of Egypt, but the Crusaders would probably not consider it worth the hassle to invade a Christian state (it’ll need to be a more tolerant guy in charge I guess) so they have them swear fealty instead?
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