New Kings and Generals animated historical animated documentary video on the Byzantine-Crusader-Bulgarian Wars, as well as the Fourth Crusade and the Sack of Constantinople, fragmentation, and restoration of the Eastern Roman Empire and Frankokratia will cover a number of battles including Tryavna, Zara, Sack of Constantinople, Adrianople, Klokotnica, Constantinople 1241, Pelagonia and Constantinople 1261.