John Calvin was a French theologian, pastor and reformer in Geneva during the Protestant Reformation.
Menno Simons was a Dutch Anabaptist theologian and leader who founded the Mennonite movement, promoting pacifism and adult baptism.
John Knox was a Scottish clergyman, theologian, and writer who led the Protestant Reformation in Scotland and shaped the country's religious identity.
Philip Jakob Spener was a prominent German theologian and Lutheran minister who significantly influenced the rise of Pietism in the late 17th century.