Jacqueline Of Bavaria, countess of Hai-naut, Holland, Zealand, and Friesland, born in 1400, died in 1436. She was the only daughter and heir of William VI. of Bavaria, count of Holland and Hainaut, and of Margaret of Burgundy. At the age of five years she was, by a treaty between her father and Charles VI. of France, betrothed to Prince John, brother of the dauphin, himself a child. In 1415, upon the death of his brother, John became dauphin, but continued to reside with his father-in-law. In 1417 he returned to France, but three days after his arrival there was killed by poison. The same year Jacqueline succeeded to her father's estates and dignities. Henry V. of England solicited her hand for his brother the duke of Bedford, but she married her cousin german John IV., duke of Brabant, a boy in his 16th year. She soon left him, and lived at first at Valenciennes with her mother. In 1420 she went to England, where Henry V. welcomed her and gave her a pension of £100 a month, and Humphrey duke of Gloucester, the king's brother, sought to marry her, treating her marriage with the duke of Brabant as invalid.

Their marriage was delayed by King Henry, lest it should interrupt his friendly relations with the duke of Burgundy, who supported the cause of his cousin John of Brabant. After the death of Henry V. the antipope Benediet XIII. annulled her former marriage, and in 1423 she married Gloucester, who at once demanded her estates, and entered Hainaut with her with 5,000 troops to reclaim them. A challenge passed between the dukes of Gloucester and Burgundy, and they agreed to settle the dispute by single combat. Both withdrew their troops, and Gloucester returned to England, leaving Jacqueline, at the entreaty of the citizens, in Mons. The duel was forbidden by the pope, and the duke of Brabant resuming the war, Jacqueline was treacherously given up by the citizens to her enemies. She was imprisoned in Ghent, but escaped in male attire on horseback by night, and fled to Holland, where she was welcomed, and sustained against the Burgundians in a war of two years. In 1426 the duke of Brabant died, and she resumed the title of duchess of Gloucester; but Gloucester helped her little, and at length she made a treaty with the duke of Burgundy, making him her heir and guardian of her fortresses, and agreed not to marry without his consent, thus virtually disavowing her marriage with Gloucester, who soon publicly married Eleanor Cobham. In disregard of this treaty Jacqueline married in 1432 a private gentleman named Francis of Borselen, governor of Zealand. The duke of Burgundy arrested and imprisoned Borselen, and Jacqueline purchased his liberation by surrendering to Burgundy all her estates, reserving to herself only a small annuity.

She died three years later without issue.