Who was the person responsible for the call of a crusade and why

Pope Urban II was the person responsible for the very influential speech that called for the start of a crusade. He wanted to take back the Holy Land from the Muslims, along with the leader of the Byzantine Empire writing him a letter asking for help. This was a very powerful speech which started the rise of the Crusaders, who Pope Urban II promised if they would fight in this war they would get the remission of their sins, even if they died in battle.

i believe it was spain