Born: January 6, 1493, Örebro, Sweden.
Died: April 19, 1552, Stockholm, Sweden.
Buried: Great Church, Stockholm, Sweden.
A leader of Swedish Lutheranism, Olavus and his brother Laurentius studied at Wittenberg, Germany, and were influenced by Martin Luther.
After Sweden received independence from Denmark, King Gustavus Vasa made Olavus a pastor and city councilman in Stockholm. However, the king wanted to control the church, and was often in conflict with Petri.
Tthe king even went so far as to condemn Petri to death, but later pardoned him.
Petri wrote Swedish translations of the New Testament and the Latin mass, and a catechism.