Russians also sometimes enslaved large parts of the Finnish population both Swedes and Finns. Swedish boys were praised for their high literacy and almost all Swedish slaves being able to read. Being considered luxury goods by Russians nobles and Crimean nobles for their beautiful blonde eyes and blonde hair. Slavery was banned, in Sweden in the 14 century. But the primitive ruling system in Russia enabled slavery to remain economically feasible. During the Swedish and Russian wars, Swedes were frequently sold into slavery by Russian Tatars. Due to the Swedish kingdoms, higher morals and political pressure concerning slavery created a demand to stop the slave trade of Finnish and Swedish slaves in Russia among Russian noblemen. Swedish slaves were the most expensive of all slaves due to their high literacy rates and used as a sign of status. Only rich Russian noblemen could afford Swedish child slaves or men. Approximately 30000 swedes and Finns were sold at Russian slave markets.