Why did 2nd crusade begin?

Answer 1

The Second Crusade began in response to the fall of the County of Edessa in 1144, which was the first Crusader state established in the Holy Land. The loss alarmed Christian leaders in Europe and prompted Pope Eugene III to call for a renewed campaign to reclaim the territory and support the Crusader states. Additionally, the growing threat from Muslim forces under leaders like Zengi further fueled the urgency for the Crusade. Overall, the desire to protect Christian holdings and respond to Muslim advances motivated the Second Crusade.