East Slavs
The East Slavs emerged from the undifferentiated early Slavs in the Slavic migrations of the 6th and 7th centuries CE. The state of Kyivan Rus united the East Slavs during the 9th to 13th centuries. East Slavic tribes cited as "proto-Ukrainian" include the Volhynians, Derevlianians, Polianians, and Siverianians and the less significant Ulychians, Tivertsians, and White Croats.