enlarged and rebuilt as a fortress by the Byzantine emperor Alexius Comnenus in 1110 AD, and was restored and slightly modified several times by the Ottoman Turks , most significantly in 1509 and 1763. [2] The most re... Read more Yedikule http://www.istanbul-istanbul.net/sevencastles.htm Yedikule hisari or shortly Yedikule, being one of important architectural