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Tripoli; During Umayyad rule, Tripoli became a commercial and shipbuilding center. It achieved semi-independence under Fatimid rule, when it developed into a Center of learning. The Crusaders laid siege to the city at the beginning of the 12th century and were able finally to enter it in 1109. This caused extensive destruction, including the burning of Tripoli's famous library, Dar al-Ilm (House of Knowledge)