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Step-by-step explanation:
Damascus was a rich city that gained its wealth from the trades on the silk road as well as from its agriculturally rich lands. The city had a religious importance for both Muslims and Christians. It was the capital of the Umayyad empire from 661-760CE and was a great centre for learning and arts. The seige of Damascus by the second crusaders failed, as Damascus was well protected by it's archers and fighters.
Rome played a role in helping the Byzantine empire. The pope sent help to the Byzantines in 1095CE and had hoped to reunite the Christian churches and also protect the Christian control of the holy lands and unique sites of historical significance.
The seige of Constantinople which occurred in 1204 marked the conclusion of the fourth crusade. Constantinople, the capital of the Byzantine empire was captured, looted and destroyed by the crusader armies. This was a major turning point in medieval history.