 The Russian history of Omsk began with the 1584 arrival of a Cossack force under the command of ataman Yermak, who defeated local rulers and established nominal Russian control of the area.To support further expansion tsars Feodor I and Boris Godunov initiated the construction of fortified settlements and military outposts in the south of Siberia in order to defend their subjects from raiding nomadic tribesmen and to exert authority over local populations, specifically over the tribute-paying Siberian Tatars of The Baraba Lands.The first permanent Russian settlement in the region, the city of Tara, was founded in 1594, soon it began to play an important part in fur trade that connected Russia with Central Asia and China.