 John Ernest I, Duke of Saxe-Weimar

Johann Ernst I, Duke of Saxe-Weimar (21 February 1594 in Altenburg – 6 December 1626 in Sankt Martin, Hungary), was a duke of Saxe-Weimar.Born as the eldest son of Johann, Duke of Saxe-Weimar and Dorothea Maria of Anhalt, during his first years, Johann Ernst had a tutor and arms master, Matt of Johan.