Rumelihisarı

…narrowest point; this fortress, called Rumelihisarı, still forms one of the principal landmarks of the straits. The siege of the city began in April 1453. The Turks had not only overwhelming numerical superiority but also cannon that breached the ancient walls. The Golden Horn was protected by a chain, but…

…the Boğazkesen (later called the Rumelihisarı), a fortress at the narrowest point of the Bosporus, in order to restrict passage between the Black and Mediterranean seas. Mehmed then tasked the Hungarian gunsmith Urban with both arming Rumelihisarı and building cannon powerful enough to bring down the walls of Constantinople. By…

…Bayezid I in 1390–91, and Rumelihisarı, built directly across the strait by Mehmed II in 1452. With the growing influence of the European powers in the 19th century, rules were codified (in treaties of 1841 and 1871) governing the transit of commercial and naval vessels through the strait. An international…