Further information: Turkic migration, History of Anatolia, and History of the Turkic peoples
Before the Turkic settlement, the local population of Anatolia had reached an estimated level of 12 to 14 million people during the late Roman Period.[2][3][4] The migration of Turks to the country of modern Turkey occurred during the main Turkic migration across most of Central Asia and into Europe and the Middle East which was between the 6th and 11th centuries. Mainly Turkic people living in the Seljuk Empire arrived Turkey in the eleventh century. The Seljuks proceeded to gradually conquer the Anatolian part of the Byzantine Empire. In the following centuries, the local population began to be assimilated into the Turkish people. More Turkic migrants began to intermingle with the local inhabitants over years, thus the Turkish-speaking population was bolstered.