Which event took place during the fourth crusade? jerusalem was returned to christian control. muslim forces attacked rome. the crusaders attacked constantinople. jerusalem was declared a neutral city.

The correct answer is C) the Crusaders attacked Constantinople.

The event that occurred in the 4th Crusade was the Crusaders attacked Constantinople.

The sack of Constantinopea took place in April 1204, during the 4th Crusade. The Crusaders attacked, destroyed and robbed during the assault of Constantinople. These actions were critiqued by Christians because they went against their moral principles. After all the struggle, Baldwin of Flanders was named Emperor, but the Byzantines refused to accept him and the territory was divided into four states in permanent conflict.  

d: their own individual powers within the new goverment