Although Charles XII managed to beat Denmark, Russia's attacking troops (in the Battle of Narva) and Poland, one at a time, the Swedish finally suffered a decisive defeat to the Russians in the Battle of Poltava in 1709. After this, the king fled to Turkey and the realm was open to an enemy attack. Vyborg was conquered in 1710, and the Russians occupied the rest of Finland after the Battle of Pälkäne in Pälkäne, the Battle of Storkyro in Ostrobothnia and the Battle of Gangut in front of Hanko by 1714. The Russian invasion period from 1714 to 1721 is commonly called the Greater Wrath. The occupation period was destructive to Finland. Thousands of people were killed and even more were sent to Russia, and a large part of the country's officials and clergy fled to Sweden. The Great Northern War and the Greater Wrath ended in the Treaty of Nystad in 1721. In the treaty, Ingria, Estonia, Livonia, the Käkisalmi county and Vyborg were annexed to Russia. The part of Karelia annexed to Russia is commonly called Old Finland. 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 Ottoman 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, Finns were frequently sold into slavery by Russian cossacks. Due to the Swedish state, 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.