The given image is of Martin Luther.
Who was Martin Luther?
Martin Luther was a German priest, theologian, author, composer, and former Augustinian monk.
He was famous for Protestant Reformation and as the namesake of Lutheranism. He believed that eternal life cannot be earned but is a result of god's grace.
He translated the Bible in German language which made it more accessible to the laity. The persons who followed his ideologies and beliefs are called Lutherans.
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