In 1558-63, Russia fought countries to the west in the Livonian War. They lost lands around the Baltic Sea to the west, but the war gave Ivan more control over his own country. Ivan was harsh towards the Russian nobles (known as the "boyars"). He executed many and took lands from others in order to make himself more powerful. This was known as the "oprichnina", and it was done by his private army called the "Oprichniks". In 1570 Ivan and the Oprichniks also killed many people in Novgorod, a city he thought was not being loyal to him. Later in his reign, Russia had battles with the Ottoman Empire (Turkey) and Tatars and conquered more lands to the east, including Siberia. Ivan also increased trade with England and set up Russia's first printing press.