Hmm... looks like Manzikert did happen, hence the Sultanate of Rum, and the Crusades, so the POD would be post-1071 (unless the Crusades and Turkish incursions into Anatolia occurred differently). It does look like the Second Crusade was a mixed bag, not being able to relieve Edessa, but with some holdings in North Africa obtained by the Italians. Maybe French King Louis IX (I think) perished in the Second Crusade, leading to the partition of France. Apparently Bulgaria did not revolt away from Byzantium either, and Novgorod, not Kiev, is the most prominent Russian duchy. Anywhere close?