As is known from medieval sources, the Bosphorus, which is Constantinople, the Dardanelles and in the Middle Ages called sleeve, Strait of Saint George , p.141. Here he writes MA Fences: "Arm of St. George -. Name is used in the West since the time of the First Crusade to refer to the Bosphorus as a whole. In Robert de Clary - the designation of all the strait of the Hellespont (Dardanelles) until the end of the Bosphorus. Name - wondering Fences - occurred either from the monastery of St. George Mangane or from the arsenal in the fortress of Constantinople, prevailing over the Bosphorus ", p.141.