The correct answer is: It caused Western knights to sack Constantinople.
The Great Schism of 1054, which split Christianity into the Western (Roman Catholic) and Eastern (Orthodox) churches, had significant implications for the Crusades. One notable impact was the tension between the two branches of Christianity, particularly during the Fourth Crusade (1202-1204). Instead of focusing solely on reclaiming the Holy Land from Muslim control, Western knights diverted to Constantinople, leading to the infamous sack of the city in 1204. This act deepened the rift between the Eastern and Western churches and had lasting effects on Christian unity and relations between the two branches.
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