Who agreed to help the Byzantines who were attacked by Muslim Turks in the holy land?

Pope Urban II agreed to help the Byzantines when they were attacked by Muslim Turks in the Holy Land. In response to a request for assistance from Byzantine Emperor AlexiOS I Komnenos, he called for the First Crusade in 1095 at the Council of Clermont. This rallying cry aimed to aid the Byzantines and reclaim Jerusalem, leading to a large-scale mobilization of Christian knights and soldiers from Europe.