Issue of Edward III of England

Edward, the Black Prince (15 June 1330 – 8 June 1376), Duke of Cornwall, Prince of Wales. Although he was eldest son of Edward III, he predeceased his father thus never became king. Edward's only surviving child was Richard II who ascended to the throne but produced no heirs. Richard II designated as his heir presumptive his cousin Roger Mortimer, 4th Earl of March, senior heir of Lionel of Antwerp through Philippa of Clarence, but this succession never took place as Richard II was eventually deposed and succeeded by another of Richard's cousins, Henry Bolingbroke (who ascended as Henry IV), senior heir of John of Gaunt. Roger Mortimer had therefore a more senior right to the crown than Henry, but Edward III had reverted this ranking in 1376 by omitting Philippa from the order of succession.

Monument to William of Hatfield in York Minster, with effigy

William of Hatfield (1336 – 1337), second son, was born at Hatfield Manor House in Hatfield near Doncaster in the West Riding of Yorkshire late in 1336, where Edward III kept Christmas with Queen Philippa. He was baptised by William Melton, Archbishop of York, but died soon afterwards. He was buried at York Minster on 10 February 1337,[5][6][7] where survives his monument with effigy in the north quire aisle, the position of his burial being unknown.

Lionel of Antwerp, 1st Duke of Clarence (29 November 1338 – 7 October 1368), third son. He also predeceased his father. Lionel's only child, Philippa, was acquired as a wife by the powerful Mortimer family, which as noted above had exerted enormous influence during the reigns of Edward II and Edward III. Philippa's son Roger Mortimer, 4th Earl of March, was the designated heir of King Richard II but predeceased him, leaving his young son Edmund as heir presumptive. Anne Mortimer, Edmund Mortimer's eldest sister and Lionel of Antwerp's great-granddaughter, married Richard, Earl of Cambridge, of the House of York, merging the Lionel of Antwerp/Mortimer line into the York line.

John of Gaunt (6 March 1340 – 3 February 1399), 1st Duke of Lancaster, fourth son.

From the marriage of John of Gaunt and Blanche of Lancaster, daughter and heiress of the Duke of Lancaster, descended legitimate male heirs, the Lancasters (King Henry IV (1399–1413), who as Henry of Bolingbroke in 1399 deposed his first cousin King Richard II (1377–1399), and was followed by his son King Henry V (1413–1422) and the latter's son King Henry VI (1422–1471). This line ended in 1471 when King Henry VI's son Edward of Westminster, Prince of Wales, was killed at the Battle of Tewkesbury and when he himself was deposed by his third cousin Edward, 4th Duke of York, of the York faction (great-grandson of Edmund of Langley, 1st Duke of York, 5th son of King Edward III), who reigned as King Edward IV.

The Lancaster kings also had Plantagenet ancestry on the female side from Blanche of Lancaster, wife of John Gaunt, daughter of Henry of Grosmont, 1st Duke of Lancaster (c. 1310–1361), descended from Edmund Crouchback, 1st Earl of Lancaster, the second son of King Henry III (1216–1272), the great-grandfather of King Edward III. A legend was developed, although without foundation, claiming that Edmund Crouchback was older than his brother King Edward I and had been passed over in the succession because of physical infirmity.[8]

John of Gaunt's legitimized heirs were the Beaufort family, his descendants by his mistress, and later his wife, Katherine Swynford. Gaunt's great-granddaughter from this union, Margaret Beaufort (1443–1509), was the senior legitimate descendant of the Beauforts and married into the House of Tudor, producing a single child Henry Tudor, Earl of Richmond, who in 1485 at the Battle of Bosworth seized the throne from his mother's second cousin King Richard III (1483–1485) and ruled as King Henry VII (1485–1509). While the Beaufort offspring had been legitimized by Richard II by act of parliament and papal bull, after Gaunt's eventual marriage to Katherine Swynford, this was later, by letters patent issued by Henry IV, conditioned that they be barred from ascending the throne. Undeterred by this, and following the 1461 seizure of the throne by the Yorkist King Edward IV (1461–1483) from the Lancastrian King Henry VI (1422–1461), the Tudors claimed precedence to the Yorks the last of whom, King Richard III was killed at the Battle of Bosworth in 1485.

The present Somerset family, Dukes of Beaufort, of Badminton House in Gloucestershire, are illegitimate direct male descendants of John of Gaunt, being illegitimate descendants of Henry Beaufort, 3rd Duke of Somerset, first cousin of Margaret Beaufort (1443–1509). They assumed "Somerset" as their family surname, but bear as arms the ancient arms of the Beaufort family: The royal arms of King Edward III within a bordure compony argent and azure,[9] and in 1682 were created Dukes of Beaufort.

Edmund of Langley, 1st Duke of York (5 June 1341 – 1 August 1402), fifth son. His descendants were the Yorks. He had two sons: Edward of Norwich, 2nd Duke of York, killed fighting alongside Henry V at the Battle of Agincourt, and Richard of Conisburgh, 3rd Earl of Cambridge, executed by Henry V for treason (involving a plot to place heir presumptive Edmund Mortimer, 5th Earl of March, Cambridge's brother-in-law and cousin, on the throne). As noted above, Richard had married Anne de Mortimer, this giving their son (and the House of York), through Lionel of Antwerp, a more senior claim than that of both the House of Lancaster, which descended from a younger son than Lionel, and the House of Tudor, whose legitimized Beaufort ancestors had been debarred from the throne. In 1460 Richard, 3rd Duke of York, claimed the throne on this basis, but an Act of Accord meant he instead became heir. However he was killed later that year, causing his son Edward to take over.

Monument and effigies of William of Windsor and of his sister Blanche, who both died as infants; Westminster Abbey

William of Windsor (24 June 1348 – 5 September 1348), 7th son. Died from the plague as an infant.

Thomas of Woodstock, 1st Duke of Gloucester (7 January 1355 – 8/9 September 1397), eighth son. He was one of the Lords Appellant influential under Richard II, was murdered or executed for treason, likely by the order of Richard II; his eventual heir was his daughter Anne, who married into the Stafford family, whose heirs became the Dukes of Buckingham. Henry Stafford, 2nd Duke of Buckingham, descended on his father's side from Thomas of Woodstock, and on his mother's side from John Beaufort.