 Emperor Constantine Porphyrogenitus wrote that the Magyars " had of old their dwelling next to <unk> , in the place called Levedia , " adding that " a river <unk> , also called <unk> " ran through this territory . The identification of the ( one or two ) rivers is uncertain . Porphyrogenitus associated Levedia with the whole territory dominated by the Magyars , but most modern historians agree that he only described a smaller region situated on the Don River . The period when the Magyars settled in Levedia is also uncertain ; this happened either before 750 ( István Fodor ) or around 830 ( Gyula Kristó ) . Porphyrogenitus said that the Magyars had been named " <unk> <unk> " , or " steadfast <unk> " , while staying in Levedia . Róna @-@ Tas says the ethnonym is an invented term with no historical credibility . Based on the same denomination , Károly <unk> , Dezső <unk> , Victor Spinei , and other historians associated the Magyars either with the late 6th @-@ century Sabirs or with the <unk> tribe of the Volga Bulgars . 
