The Governorate of Est(h)onia (Estonian: Eestimaa kubermang) or Duchy of Estonia, also known as the Government of Estonia, was a governorate of the Russian Empire in what is now northern Estonia. The Governorate was gained by the Russian Empire from Sweden during the Great Northern War in 1721. The Russian Tsars held the title Duke of Estonia (Russian: Князь Эстляндский, Knyaz' Estlyandskii), during the Russian era in English sometimes also referred to as Prince of Estonia.