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 form of "Ankara". In 278 BC, the city, along with the rest of central Anatolia, was occupied by the Celtic speaking Galatians, who were the first to make Ankara one of their main tribal centres, the headquarters of the Tectosage tribe. Other centres were Pessinos, modern Balhisar, for the Trocmi tribe; and "Tavium", to the east of Ankara, for the Tolstibogii tribe. The city was then known as Ancyra. The Celtic element was probably relatively small in numbers; a warrior aristocracy which ruled over Phrygian-speaking peasants. However, the Celtic language continued to spoken in Galatia for many centuries. At the