Johann Friedrich I of Saxony, also called Friedrich the Magnanimous, (* 30. June 1503 in Torgau; † 3 March 1554 in Weimar) from the house of the Ernestine Wettins was Elector and Duke of Saxony from 1532 to 1547 and after losing the electoral dignity in 1547 until his death only Duke of the Ernestine part of the country. In the city of Jena, where he founded the university that still exists today, he is known as Hanfried. Johann Friedrich I was the eldest son of the Saxon Elector John the Constant (1468-1532) from his first marriage to Sophie (1481-1503), daughter of Duke Magnus II. to Mecklenburg. Johann Friedrich married on 9. February 1527 in Torgau Sibylle (1512–1554), daughter of Duke Johann III. von Jülich-Kleve-Berg, to whom he had been engaged a year earlier. Johann Friedrich prom