Final answer:
The Fourth Crusade was launched by Catholics against Constantinople, marking a divergence from previous crusades focused on reclaiming Christian lands and resulting in the sack of Constantinople and strained relations between the Greek Orthodox and Catholic churches.
Step-by-step explanation:
The Fourth Crusade was launched by the Catholics against Constantinople. In a significant divergence from previous crusades, which had primarily aimed at reclaiming formerly Christian lands from Muslim control, the Fourth Crusade ended up entangled in Byzantine Empire's internal politics.
This culminated in the Crusaders attacking the city and establishing the short-lived Latin Empire after the sack of Constantinople in 1204. This event significantly damaged the relationships between the Greek Orthodox and Catholic churches and represented a betrayal of the original ideals of the crusading movements.
The Fourth Crusade was launched by the Catholics against Constantinople. The crusaders, responding to the call of Pope Boniface IX, aimed to rescue the Greek Orthodox Christians from the Muslim Turks.
However, the Fourth Crusade took a different direction and became involved in the internal politics of the Byzantine Empire, attacking and sacking Constantinople in the process.