 Starting from the province of Rûm he managed to bring first Anatolia and then the European territories (Rumelia) under his control, reuniting the Ottoman state by 1413, and ruling it until his death in 1421.Mehmed was born in 1389 as the fourth son of Sultan Bayezid I () and one of his consorts, the slave girl Devlet Hatun.Following Ottoman custom, when he reached adolescence in 1399, he was sent to gain experience as provincial governor over the Rûm Eyalet (central northern Anatolia), recently conquered from its Eretnid rulers.