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John III the Pitiless, Duke of Bavaria-Straubing, of the House of Wittelsbach, was first bishop of Liège 1389-1418 and then duke of Bavaria-Straubing and count of Holland and Hainaut 1418-1425.
He was the youngest son of Duke Albert I and Margaret of Brieg. His elder brother was William II of Bavaria, who succeeded their father as Count of Holland, Zeeland and Hainault in 1404. His sister was Margaret of Bavaria, who married in 1385 with John the Fearless, Duke of Burgundy.
When his brother died in 1417 and was succeeded by his daughter Jacqueline as Countess of Holland and Hainaut and Duchess of Bavaria-Straubing, John the Pitiless rejected holy orders and surrendered his bishopric. In 1418, John III married Elisabeth, Duchess of Luxembourg, who was then the widow of Antoine, Duke of Brabant. No children came from this marriage.
John the Pitiless died of poison in 1425 in The Hague. | 
