About the fifth century B.C., when the population of the Balkan-Carpathian region consisted of various tribes belonging to the Indo-European family, the northern portion of the Balkan peninsula was conquered by the Thracians and the Illyrians. The Thracians spread north and south, and a branch of their race, the Dacians, crossed the Danube. The latter established themselves on both sides of the Carpathian ranges, in the region which now comprises the provinces of Oltenia (Rumania), and Banat and Transylvania (Hungary).