DBWI: Turks Win At Manzikert

We all know that the Byzantine Empire crushed the Turkish barbarians at Manzikert and how it fended off the Russians, Persians, Hungariand, Mongols, the Church and finally the Germans. What if it didn't? What if Byzantium lost at Manzikeet? What if?
 
The Turks would have been Hellenized within a generation and Orthodoxized within another two generations. In order to rule the masses of Greek Orthodox peoples, the ruling Turkish elite would have to assimilate or die. It would really just be a change in dynasties similar to how when the Plantagenets took over France nothing really changed for the French.
 
How badly do the Romans lose?

If its a minor defeat nothing really changes in the short term. The Empire simply beats them later some other time. Now if the Turks manage to inflict a defeat as massive as happened to them OTL the Romans *might* collapse. I'm still not sure an empire like Rome could fall from losing one battle, but it might lay dominoes that eventually lead to being conquered.
 
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