Duke Stephen III of Bavaria was a Duke of Bavaria since 1375.
Background
He was the eldest son of Stephen II and Elizabeth of Sicily. Maria was a daughter of Stephen V of Hungary and his wife, queen Elisabeth, who was daughter of Zayhan of Kuni, a chief of the Cuman tribe and had been a pagan before her marriage. Stephen V was a son of Béla IV of Hungary and Maria Laskarina.
Career
Her parents were Charles II of Naples and Maria Arpad of Hungary. Maria Laskarina was a daughter of Theodore I Lascaris and Anna Angelina. Anna was daughter of Eastern Roman Emperor Alexius III and Euphrosyne Doukaina Kamaterina.
However, in 1392, Bavaria was split into three separate Duchies, now consisting of Bavaria-Landshut, Bavaria-Ingolstadt and Bavaria-Munich.
After the division of Bavaria, Stephen retained Bavaria-Ingolstadt, although he soon came to regard his share to be inferior to the other two Duchies. From 1395 to 1397, he also jointly held Bavaria-Munich with John II, after an armed conflict between the brothers.
In opposition to them, Stephen also supported King Rupert against the Luxemburg. In 1403, he supported the citizens" uprising in Munich, although that failed.
His final attempt in 1410 to reconquer Tyrol, which his father had ceded to the Grand Duchy of Habsburg was likewise unsuccessful.