Qaitbay Fort Alexandria formulated an important part of the fortification system of Alexandria. It was in the 15th century AC . It situated at the entrance of the eastern harbor on the eastern point of the Pharos Island. It erected on the exact site of the famous Lighthouse of Alexandria. Alexandria Lighthouse was one of the Seven Wonders of the Ancient World. The lighthouse continued to function until the time of the Arab conquest. Several disasters occurred and the shape of the lighthouse changed to some extent. But it still continued to function. Restoration began in the period of Ahmed Ibn Tulun in 880 H . During the 11th century an earthquake occurred, causing damage to the octagonal part. The bottom survived, but it could only serve as a watchtower. A small Mosque built on the top. In the 14th century there was a destructive earthquake. The whole building completely destroyed. Sultan Al Ashraf Qaitbay fortified the place as part of his coastal defensive edifices. It was against the Turks, who were threatening Egypt in 1480 AC. He built the castle and placed a mosque inside it. Qaitbay Fort Alexandria functioned during most of the Mameluke period, Ottoman period and Modern period.