Philip Melanchthon
Philip Melanchthon (born Philipp Schwartzerdt; 16 February 1497 – 19 April 1560) was a German Lutheran reformer, collaborator with Martin Luther, the first systematic theologian of the Protestant Reformation, intellectual leader of the Lutheran Reformation, and an influential designer of educational systems. He stands next to Luther and John Calvin as a reformer, theologian, and molder of Protestantism. After Luther himself, he is the primary founder of Lutheranism.
Lutheran orthodoxy
The theological heritage of Philip Melanchthon arose again in the Helmstedt School and especially in the theology of Georgius Calixtus (1586-1656), which caused the syncretistic controversy of 1640-1686. Another theological issue was the Crypto-Kenotic Controversy of 1619-1627.