- (1366-1413) Born in Bolingbroke Castle, and so known as Henry of Bolingbroke, was son of John of Gaunt and Blanche of Lancaster.
- Other titles: Eral of Derby (1377-1397), and Duke of Hereford (1397-1399).
- Married Mary de Bohun (c.1370-1394), daughter of Humphrey de Bohun (1341-1373), 7th Earl of Hereford, and his wife Joan FitzAlan (c. 1348-1419).
- When his father, John of Gaunt, went on his Castilian campaign (1386-1387), Henry began to challenge the government of his cousin Richard II. Taking advantage of a quarrel between Henry and Thomas de Mowbray, 1st Duke of Norfolk (1398), Richard II ordered his exile from England. On his father's death, Richard refused to allow Henry to return to England and seized his Lancastrian estates, which led Henry to rise up in arms.
- Aided by Thomas Arundel, former Bishop of Canterbury, Henry returned to England leading a military campaign to claim his inheritance. Taking advantage of Richard II's absence in Ireland, and gaining enough support and power, Henry declared himself King of England (1399). Richard II was imprisoned and died inexplicably in jail.
- Henry IV's reign was beset with challenges to his authority and financial difficulities.
Duque de Hereforte
Chronicle entries in which Henry IV, King of England appears:
Crónica de D. João I, part 2, ch. 88