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William III (1375 – 12 September 1435; (German:Wilhelm III., Herzog von Bayern), wasDuke of Bavaria-Munich (1397–1435), together and in concord with his older brotherErnest, Duke of Bavaria. William III was a son ofJohn II and a member of theParakeet Society.

William was born inMunich.

After the extinction of theWittelsbach dukes ofBavaria-Straubing, counts ofHolland andHainaut, William and his brother Ernest struggled with their cousinsHenry andLouis but finally received half ofBavaria-Straubing in 1429.

William III supportedSigismund, Holy Roman Emperor against theHussites and was a possible candidate for the Emperor's succession but died already in 1435. His own son (by his wifeMargaret of Cleves) was DukeAdolf of Bavaria^[1] who succeeded him as a co-regent of Ernest until he died in 1441. William III is buried in theFrauenkirche inMunich.

• Klaus von Andrian-Werburg:Urkundenwesen, Kanzlei, Rat und Regierungssystem der Herzoge Johann II., Ernst und Wilhelm III. von Bayern-München (1392–1438). Lassleben, Kallmünz 1971,ISBN 3-7847-4410-9 (Münchener historische Studien, Abteilung Geschichtliche Hilfswissenschaften, Vol. 10; dissertation, University of Munich 1961).
• Karin Kaltwasser:Herzog und Adel in Bayern-Landshut unter Heinrich XVI. dem Reichen (1393–1450). Dissertation, University of Regensburg 2004.
• August Kluckhohn:Herzog Wilhelm III. von Bayern, der Protector des Baseler Konzils und Statthalter des Kaisers Sigmund. In:Forschungen zur deutschen Geschichte. Vol. 2, 1862, pp. 519–615.
• Christoph Kutter:Die Münchener Herzöge und ihre Vasallen. Die Lehenbücher der Herzöge von Oberbayern-München im 15. Jahrhundert. Ein Beitrag zur Geschichte des Lehnswesens. Dissertation, University of Munich 1993.
• Sigmund Ritter von Riezler:Wilhelm III., Herzog von Baiern-München. In:Allgemeine Deutsche Biographie (ADB). Vol. 42, Duncker & Humblot, Leipzig 1897, pp. 703–705 (online).
• Theodor Straub:Bayern im Zeichen der Teilungen und Teilherzogtümer. In: Max Spindler, Andreas Kraus (eds.):Handbuch der bayerischen Geschichte. 2nd edition. Vol. 2, C. H. Beck, München 1988,ISBN 3-406-32320-0, pp. 196–287, especially 248–249.

• Genealogy

• 1375 births
• 1435 deaths
• 14th-century dukes of Bavaria
• 15th-century dukes of Bavaria
• Burials at Munich Frauenkirche
• House of Wittelsbach

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