John I, Duke of Saxony
John I ruled as duke of Saxony from 1260 until 1282.
John was the elder son of Duke Albert I of Saxony and his third wife Helen, a daughter of Otto the Child. John and his younger brother Albert II jointly ruled the Duchy of Saxony after the death... Wikipedia
Born: 1249
Died: July 30, 1285 (age 36 years), Wittenberg, Germany
Parents: Albert I, Duke of Saxony
Spouse: Ingeborg Birgersdotter of Bjelbo
Grandchildren: Eric II, Duke of Saxe-Lauenburg, Albert IV, Duke of Saxe-Lauenburg, Erich von Sachsen-Ratzeburg, and more