Relations between Ottoman Empire and Britain have a long history. Since 1354 the Ottoman Empire have advanced westwards and conquered Constantinople and renamed it to Istanbul in 1453 and gained control of the black sea and the main routes to the Balkans and driving on to the eastern Adriatic. In 1520 Ottoman Empire was the undisputed leader of the Muslim world and they cast their shadow over western Europe. Then the encounters between Ottoman Empire and Britain have begun. Formal diplomatic relations were established with the appointment of an English ambassador to the Sublime Porte as the ottoman government was known in 1583. in 1793 London received one of the first permanent Turkish embassies established abroad.