 It was done first by following the Angara River upstream from Yeniseysk (founded 1619) and later by moving south from the Lena River.Russians first heard of the Buryats in 1609 at Tomsk.According to folktales related a century after the fact, in 1623, Demid Pyanda, who may have been the first Russian to reach the Lena, crossed from the upper Lena to the Angara and arrived at Yeniseysk.