Mikael Agricola (Finnish: [ˈmikɑel ˈɑɡrikolɑ] ; c. 1510 – 9 April 1557) was a Finnish Lutheran clergyman who became the de facto founder of literary Finnish and a prominent proponent of the Protestant Reformation in Sweden, including Finland, which was a Swedish territory at the time. He is often called the "father of literary Finnish". He died of sudden illness while returning from a trip during which he assisted in negotiating the Treaty of Novgorod with the Tsardom of Russia.