When the Venetians conquered Constantinople, the Byzantine land of Turkey and Greece have been splitered. The Osmans feels strong with an army in Bulagary and Macedonia, and soon they attack on the Greek splitred states. But The latin empire also take interest in the Greek splited Greek states. The Byzantines is poor but strong civilization. And if you play as the Byzantines You must unite the Greeks with the Byzantines. The Greeks must beware of the Latin empire this power could be dangerous for them. Your final object is to destroy the osman empire before it's to late.