Yayin da karfin Turawan Yamma ya dushe a cikin 600s Avars sun sake tabbatar da mamayarsu a kan Bulgars.Tsakanin 630 zuwa 635 Khan Kubrat na dangin Dulo ya sami damar haɗa manyan kabilun Bulgar da kuma bayyana 'yancin kai daga Avars, suna samar da wata ƙungiya mai ƙarfi da ake kira Old Great Bulgaria , wanda kuma aka sani da Patria Onoguria, tsakanin Bahar Black, Tekun Azov da Caucasus.Kubrat, wanda aka yi masa baftisma a Konstantinoful a shekara ta 619, ya kulla yarjejeniya da Sarkin Rumawa Heraclius (r. 610-641) kuma kasashen biyu sun ci gaba da kasancewa cikin kyakkyawar alaka har zuwa mutuwar Kubrat tsakanin 650 da 665. Kubrat ya yi yaki da Khazars a gabas amma Bayan rasuwarsa Tsohon Great Bulgaria ya tarwatse a karkashin matsin lamba na Khazar a 668 kuma 'ya'yansa biyar sun rabu da mabiyansu.Babban Batbayan ya kasance a ƙasarsa a matsayin magajin Kubrat kuma daga ƙarshe ya zama Khazar vassal.Ɗan'uwa na biyu Kotrag ya yi hijira zuwa tsakiyar Volga yankin kuma ya kafa Volga Bulgaria.Ɗan'uwa na uku Asparuh ya jagoranci mutanensa zuwa yammacin Danube.Na huɗu, Kuber, da farko ya zauna a Pannonia a ƙarƙashin Avar suzerainty amma ya yi tawaye ya koma yankin Makidoniya, yayin da ɗan'uwa na biyar Alcek ya zauna a tsakiyar Italiya.