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Roussel de Bailleul was a Norman adventurer who fought for the Byzantine empire, deserted at the Battle of Manzikert, was re-hired out of necessity, and then forged his own short-lived principality in Anatolia before dying in the suppression of a rebellion in Byzantine Greece.
What if he had successfully created a Christian home of the Franks in Anatolia, and ally of the Byzantines against the Seljuks? I suppose the POD would be him staying loyal to the Greeks rather than betraying them.
How would the Crusades be affected by the survival and consolidation of this independent state?