Granted, I'm playing with a bunch of mods but the only thing necessary to recreate this is to take Islamic Syncretism. (The heir to the Caliphate changes religion).
edit: just noticed he's no longer heir now. I suppose it's fine but IMO Islamic realms are too unstable/weak as it is.
edit: just noticed he's no longer heir now. I suppose it's fine but IMO Islamic realms are too unstable/weak as it is.