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In page Alexandria:

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Alexandria lost much of its importance in international trade after Portuguese navigators discovered a new sea route to India in the late 15th century. This reduced the amount of goods that needed to be transported through the Alexandrian port, as well as the Mamluks' political power.[11] After the Battle of Ridaniya in 1517, the city was conquered by the Ottoman Turks and remained under Ottoman rule until 1798. Alexandria lost much of its former importance to the Egyptian port city of Rosetta during the 9th to 18th centuries, and it only regained its former prominence with the construction of the Mahmoudiyah Canal in 1820.[citation needed]