During the First Crusade, Christian knights from Europe capture Jerusalem after seven weeks of siege and begin massacring the city's Muslim and Jewish population.
Explanation:
... In June, the crusaders captured the Turkish-held city of Nicaea and then defeated a massive army of Seljuk Turks at Dorylaeum.
New trade relations strengthened the relationship by providing both sides new goods and ideas. however, it also divided them by spreading diseases to the other.
