During the battle of Manzikert in 1071, the Byzantine Empire lost a big part of their empire to the Seljuk Turks. The Muslims were posing a threat to the Byzantine.
The Byzantine Emperor, Alexius Comnenus, asks for help from Pope Urban II of Germany early in 1095.
The Byzantine Empire is in great danger. I should seek help from western Christian kingdoms.
Take back the Holy Land from the Muslims! Deus Volt!
Pope Urban II accepted and gave a powerful speech to the Christians in Rome.