Stephen I, Duke of Lower Bavaria

Stephen I (1271–1310), born in Landshut, was the youngest son of Henry XIII of Lower Bavaria and Elizabeth of Hungary. Destined for the church in Salzburg, he was blocked by Pope Nicholas IV, and from 1290 ruled Lower Bavaria jointly with his brothers Otto III and Louis III.

While Otto pursued the Hungarian crown from 1305 to 1308, Stephen governed the duchy alone. He died in 1310 fighting the Habsburgs under Frederick I of Austria, leaving sons Henry XIV and Otto IV.