Otto III, Duke of Lower Bavaria

Otto III (1261–1312), eldest son of Henry XIII, succeeded his father in 1290 and ruled Lower Bavaria jointly with his brothers Louis III and Stephen I. A grandson of Béla IV of Hungary, he fought for King Adolf against the Habsburgs at Göllheim in 1298.

Offered the Hungarian crown in 1301, he accepted in 1305 after Wenceslaus III renounced his claim. Otto slipped into Buda disguised as a merchant and was crowned at Székesfehérvár in December. His rival Charles of Anjou seized fortresses and Buda, and Ladislaus Kán of Transylvania imprisoned him in 1307. Otto abdicated in 1308 and died at Landshut in 1312.