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:
Ankara to the mosque, two years before his death (1427–28). The usable space inside this mosque is on the first floor and on the second floor. It was founded in the Ulus quarter near the Ankara Citadel and was constructed by the Ahi fraternity during the late 14th and early 15th centuries. The finely carved walnut mimber (pulpit) is of particular interest. The Alâeddin Mosque is the oldest mosque in Ankara. It has a carved walnut mimber, the inscription on which records that the mosque was completed in early AH 574 (which corresponds to the summer of 1178 AD) and was