This letter dated 1616 was part of the application for Alexander's son, Georg Johann Wolfhartt, to also get into the University of Tubingen. Georg was Johann Philip Brentz's great grandfather. My guess is that this letter was written by Alexander Wolfhartt to help his son get in. According to family legend, the descendants of Casper Graeter had free tuition at the University of Tubingen because Casper had served as the Duke of Wurtenberg's top religious official and the Duke granted that to the family. Unfortunately, that perpetual family tuition-free deal ended when the monarchy in Germany ended at the end of World War 1.