Back ويليام الأول، دوق بافاريا Arabic ويليام الاول ARZ Вилхелм I (Бавария) Bulgarian Guillem I de Wittelsbach Catalan Wilhelm I. (Bayern) German Γουλιέλμος Α΄ της Βαυαρίας Greek Guillermo III de Henao Spanish Guillaume III de Hainaut French Willem V fan Hollân Frisian וילהלם הראשון, דוכס בוואריה HE
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| William I | |
|---|---|
| Duke of Bavaria | |
 Portrait by Willem Thibaut | |
| Born | 12 May 1330 Frankfurt, Holy Roman Empire |
| Died | 15 April 1389 (aged 58) Le Quesnoy |
| Spouse | Maud, Countess of Leicester |
| House | Wittelsbach |
| Father | Louis IV, Holy Roman Emperor |
| Mother | Margaret II, Countess of Hainaut |
William I, Duke of Bavaria-Straubing (Frankfurt am Main, 12 May 1330 – 15 April 1389,[1] Le Quesnoy), was the second son of Emperor Louis IV and Margaret II of Hainaut. He was also known as William V, Count of Holland, as William III, Count of Hainaut and as William IV, Count of Zeeland.