Who are the Utigur and the Kutrigur tribes – on which there is so many accounts from 6th century chroniclers as Procopius of Caesarea, Agathias of Mirena, Menander, Theophylact Simocatta? The scientific conclusion that the ethnonym "utiguri" refers to the Bulgarian ethnicity and that all information in the ancient Greek-language records referring the "utiguris", are an integral part of early Bulgarian history, is backed up sequentially in the western and the Russian history science up until the midst of twentieth century.