what were the results of the fourth crusade
Zara and Constantinople sacked
Byzantine Empire irrevocably weakened
Venetian authority asserted over Zara
Partitioning of the Byzantine Empire into rump states centred in Nicaea , Trebizond and Epirus
Solidification of the schism between the Latin and Greek churches
Outbreak of the Nicaean - Latin wars and the Bulgarian - Latin wars
Foundation of several Latin crusader states in the Balkans