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Nov 27, 1095
Emperor Alexios I contacts Pope Urban II for military help in the MIddle East
In the 11thh century, the holy land became a huge conflict to the European christians. The Turks threatned to invade so Alexios appealed for Pope Urban to help. -
Aug 21, 1204
Fourth Crusade (attack on Constantinople)
western european armed expedition to conquer muslim controlled Jerusilism by invading through Egypt instead they ended up sacking the city of Constantinople.