Question: how when and why did the first crusade transpire?
Answer: First Crusade (1096-1099) While in the 900s Byzantium had been able to reseize territory in Syria, starting around the 1030s the Seldjuk Turks gained power and territory. ... On November 27, 1095, in Clermont, France, Pope Urban II called for a crusade to help the Byzantines and to free the city of Jerusalem.