Ankara Treaty of Lausanne (1923), the Turkish nationalists replaced the Ottoman Empire with the Republic of Turkey on 29 October 1923. A few days earlier, Ankara had officially replaced Constantinople as the new Turkish capital city, on 13 October 1923. After Ankara became the capital of the newly founded Republic of Turkey, new development divided the city into an old section, called "Ulus", and a new section, called "Yenişehir". Ancient buildings reflecting Roman, Byzantine, and Ottoman history and narrow winding streets mark the old section. The new section, now centered on Kızılay Square, has the trappings of a more modern city:
History of Ankara in 1356. Another Turkic ruler, Timur, defeated the Ottomans at the Battle of Ankara in 1402 and captured the city, but in 1403 Ankara was again under Ottoman control. Following the Ottoman defeat during World War I, the Ottoman capital Constantinople was occupied by the Allies. The Turkish nationalist movement, under Kemal Atatürk, established its headquarters in Ankara in 1920 (see Turkish War of Independence). After the War of Independence was won, the Turkish nationalists abolished the Ottoman Empire on October 29, 1923. A few days earlier, on October 13, 1923, Ankara had replaced Constantinople as its capital, and it