Protestant Union
Schweinfurt joined the Protestant Union in 1609. In the Thirty Years' War it was occupied by Gustavus Adolphus, who erected fortifications, the remains of which are still extant. In 1652 the four doctors Johann Laurentius Bausch, Johann Michael Fehr, Georg Balthasar Wolfahrt and Balthasar Metzger founded the "Academia Curiosorum" in Schweinfurt, which is known today as the German Academy of Life Scientists, "Leopoldina".