<Li> The crises of the 13th century, which followed the Sack of Constantinople and partitioning of the empire by the Fourth Crusade <Ul> <Li> 1204--The Sack of Constantinople by the Fourth Crusade </Li> </Ul> </Li> <Ul> <Li> 1204--The Sack of Constantinople by the Fourth Crusade </Li> </Ul> <Li> 1204--The Sack of Constantinople by the Fourth Crusade </Li> <Li> The final decline during the Byzantine--Ottoman Wars . </Li>

The language used by the later byzantine emperors was