Seljuk (Arabic: السلاجقة, Turkish: Selçuk; also Seldjuk, Seldjuq, Seljuq) was the eponymous hero of the Seljuks. He was the son of a certain Duqaq surnamed Timuryaligh -of the iron bow- and either the chief or an eminent member from the Kınık tribe of the Oghuz Turks. In about 985 the Seljuk clan split off from the bulk of the Tokuz-Oghuz, a confederacy of nine clans long settled between the Aral and Caspian Seas, and set up camp on the right bank of the lower Syr Darya(Jaxartes), in the direction of Jend, near Kzyl Orda in present day south-central Kazakhstan where they were converted to Islam.
Under Mikail's sons Toghrul and Chaghri the Seljuks migrated into Khurasan. Ghaznavid attempts to stop Seljuks raiding the local Muslim populace led to the Battle of Dandanaqan on 23 May 1040. Victorious Seljuks became masters of Khurasan, expanding their power into Transoxiana and across Iran. By 1055Toghrul had expanded his control all the way to Baghdad, setting himself up as the champion of the Abbasidcaliph, who honored him with the title sultan. Earlier rulers may have used this title but the Seljuks seem to have been the first to inscribe it on their coins.1