John III, Duke of Bavaria-Straubing

John III the Pitiless, Duke of Bavaria-Straubing (1374–1425), 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.

John was born in Le Quesnoy. 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.

As the youngest son of three, John was destined for a career in the church. At the age of 15, he became Prince-Bishop of Liège, with the support of Pope Boniface IX. John's rule was a disaster. His authoritarian style clashed with the nobles and burghers of the Prince-Bishopric. He was expelled several times and saw even a counter-bishop being elected. John turned for help to his brother and brother-in-law.

In 1408 a Burgundian army led by his brother-in-law John the Fearless went to the aid of John III against the citizens of Liège, who were in open revolt. On the field of Othée, on 12 September 1408, the men of Liège were decisively defeated, and Burgundian influence was extended over the city and over the bishopric of Liège. The ensuing executions of leading insurgents led to John's nickname "the Pitiless".

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.

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