The ethnonym of the Hungarian tribal alliance is uncertain. According to one view, following Anonymus's description, the federation was called "Hetumoger / Seven Magyars" ("VII principales persone qui Hetumoger dicuntur", "seven princely persons who are called Seven Magyars"), though the word "Magyar" possibly comes from the name of the most prominent Hungarian tribe, called "Megyer". The tribal name "Megyer" became "Magyar" referring to the Hungarian people as a whole. Written sources called Magyars "Hungarians" prior to the conquest of the Carpathian Basin when they still lived on the steppes of Eastern Europe (in 837 "Ungri" mentioned by Georgius Monachus, in 862 "Ungri" by Annales Bertiniani, in 881 "Ungari" by the "Annales ex Annalibus Iuvavensibus").