evidence: Indo-European, Ural-Altaic, and diverse other peoples have occupied what is now the territory of Russia since the 2nd millennium bce, but little is known about their ethnic identity, institutions, and activities. In ancient times, Greek and Iranian settlements appeared in the southernmost portions of what is now Ukraine. Trading empires of that era seem to have known and exploited the northern forests—particularly the vast triangular-shaped region west of the Urals between the Kama and Volga rivers—but these contacts seem to have had little lasting impact. Between the 4th and 9th centuries ce, the Huns, Avars, Goths, and Magyars passed briefly over the same terrain, but these transitory occupations also had little influence upon the East Slavs, who during this time were spreading south and east from an area between the Elbe River and the Pripet Marshes. In the 9th century, as a result of penetration into the area from the north and south by northern European and Middle Eastern merchant adventurers, their society was exposed to new economic, cultural, and political forces.