The Russian system dated back to 1649 and the introduction of a legal code which had granted total authority to the landowner to control the life and work of the peasant serfs who lived on his land. Since this included the power to deny the serf the right to move elsewhere, the difference between slavery and serfdom in practice was so fine as to be indistinguishable. The purpose behind the granting of such powers to the Russian dvoriane (nobility of landowners) in 1649 had been to make the nobles dependent on, and therefore loyal to, the tsar. They were to express that loyalty in practical form by serving the tsar as military officers or public officials. In this way the Romanov emperors built up Russia’s civil bureaucracy and the armed services as bodies of public servants who had a vested interest in maintaining the tsarist state.The serfs made up just over a third of the population and formed half of the peasantry. They were most heavily concentrated in the central and western provinces of Russia.