Rudolf III, Duke of Saxe-Wittenberg (c. 1373 – 1419), a member of the House of Ascania and Elector of Saxony
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Upon the death of his father in 1232 he divided his family's estates with his brother Rudolph III, whereby he retained the ancestral seat at Habsburg Castle.
Ultimately, the division was made in 1412: Jan I retained Żagań, and one year later (in 1413) he also took possession over the Duchy of Przewóz, inn the Polish-German border area (obtained as a result of his marriage with Scholastika, a daughter of Elector Rudolph III).