Captiulations- gave autonomy to foreigners living in a Muslim territory (a practice adopted by the Ottomans). European nationals were freed from having to bey Ottoman laws or pay taxes. This attracted European traders, and spared the ottomans from having to settle their disputes. System adopted from the Mamluks.
Constantinople former capital of the Byzantine Empire and of the Ottoman Empire , since 1930 officially called Istanbul (for location and description, see Istanbul ). It was founded (AD 330) at ancient Byzantium as the new capital of the Roman Empire by Constantine I, after whom it was named. The largest and most splendid European city of the Middle Ages, Constantinople shared the glories and vicissitudes of the Byzantine Empire, which in the end was reduced to the city and its environs. Although besieged innumerable times by various peoples, it was taken only three timesin 1204 by the army of the Fourth Crusade (see Crusades ), in 1261 by Michael VIII, and in 1453 by the Ottoman Sultan Muhammad II. Defended by Greek fire , it was also well fortified. An early inner wall was erected by Constantine I, and the enlarged Constantinople was surrounded by a triple wall of fortifications, begun (5th cent.) by Theodosius II. Built on seven hills, the city on the Bosporus presented the appearance of an impregnable fortress enclosing a sea of magnificent palaces and gilded domes and towers. In the 10th cent., it had a cosmopolitan population