When did Otto V, Duke of Bavaria's father become the King of the Romans?
Otto V, Duke of Bavaria Otto V the Bavarian, Duke of Bavaria (1340/42 – 15 November 1379), was a Duke of Bavaria and Elector of Brandenburg as Otto VII. Otto was the fourth son of Holy Roman Emperor Louis IV by his second wife Margaret II of Avesnes, Countess of Hainaut and Holland.
Rudolf of Rheinfelden Rudolf of Rheinfelden (  1025 – 15 October 1080) was Duke of Swabia from 1057 to 1079. Initially a follower of his brother-in-law, the Salian emperor Henry IV, his election as German anti-king in 1077 marked the outbreak of the Great Saxon Revolt and the first phase of open conflict in the Investiture Controversy between Emperor and Papacy. After a series of armed conflicts, Rudolf succumbed to his injuries after his forces defeated Henry's in the Battle on the Elster.