From the time of Kievan Rus' there was trade (fur, slaves) down the Volga to the Caspian Sea and Persia. Later trade extended southeast to the main Asian trade routes at Bukhara. Under the Mongol Yoke, Russian princes would regularly travel to Sarai for investiture. When Marco Polo returned from China he mentioned Russia as an obscure country in the far north. In 1466/73 Afanasy Nikitin made a journey southeast to India and left an interesting account. After the English reached the White Sea, Anthony Jenkinson travelled through Muscovy to Bukhara. In 1608 the Voivode of Tomsk tried and failed to reach China via the Altan Khan in western Mongolia. In 1616 a second attempt got as far as the Khan (Vasilly Tyumenets and Ivan Petrov). The first Russian to reach Peking was probably Ivan Petlin in 1618/19.