Dnieper Ukraine
By the 8th and 9th century, the valleys of the Northern and Southern slopes of the Carpathian Mountains were "densely" settled by Slavic tribe of White Croats, who were closely related to East Slavic tribes who inhabited Prykarpattia, Volhynia, Transnistria and Dnieper Ukraine. Whereas some White Croats remained behind in Carpathian Ruthenia, others moved southward into the Balkans in the 7th century. Those who remained were conquered by Kievan Rus' in the late 10th century.