G. Németh, A Hongfoglaló Magyarság Kialakulása, Budapest, 1930, 264-68, cited after P. Oberling, "Karāʾi", Encyclopedia Iranica, vol. XV, Fasc. 5 (2002), pp. 536–537.
Rashid-al-Din Hamadani, Jami' al-tawarikh cited after (in Russian)translation by L.A. Khetagurov (1952)[clarification needed]
"It is said that in ancient times was the king; He had seven [eight] sons, all of them [were] swarthy. For this reason they were called Kerait. After a time, each of the branches, and the progeny of those sons got a special name and nickname. Until very recently, in Kerait was the name of one [tribal] branch, [i.e.] the sovereign one; the other sons became the servants of his brother, who was their sovereign, while they did not have sovereignty."
