Later, when Byzantium threatened its eastern trading privileges, Venice persuaded the armies of the Fourth Crusade to attack Constantinople in 1204; conquering Byzantium strengthened its position even more.
The Fourth Crusade was only against Muslim states.
mnli hypothesis: The Fourth Crusade was only against Muslim states. premise: Later, when Byzantium threatened its eastern trading privileges, Venice persuaded the armies of the Fourth Crusade to attack Constantinople in 1204; conquering Byzantium strengthened its position even more.