Philipp Jakob Spener was a German Lutheran theologian who essentially founded what would come to be known as Pietism. He was later dubbed the "Father of Pietism". A prolific writer, his two main works, Pia desideria (1675) and Allgemeine Gottesgelehrtheit (1680), were published while he was the chief pastor in the Lutheran Church at Frankfurt. In 1691, he was invited to Berlin by the court of Brandenburg. Even in Berlin, Spener was at odds with the predominant Lutheran orthodoxy, as he had been all his life. Spener influenced the foundation of the University of Halle, but the theological faculty of another university, that of Wittenberg, formally accused him of 264 errors.

Lutheranism is a major branch of Protestantism, identifying primarily with the theology of Martin Luther, the 16th-century German monk and reformer whose efforts to reform the theology and practices of the Catholic Church launched the Protestant Reformation.