Edmund Beaufort, 2nd Duke of Somerset

In 1427 it is believed that Edmund Beaufort may have embarked on an affair with Catherine of Valois, the widow of King Henry V. Evidence is sketchy; however, the liaison prompted a parliamentary statute regulating the remarriage of queens of England. The historian G. L. Harriss surmised that it was possible that another of its consequences was Catherine's son Edmund Tudor and that Catherine, to avoid the penalties of breaking the statute of 1427–1428, secretly married Owen Tudor. He wrote: "By its very nature the evidence for Edmund Tudor's parentage is less than conclusive, but such facts as can be assembled permit the agreeable possibility that Edmund 'Tudor' and Margaret Beaufort were first cousins and that the royal house of 'Tudor' sprang in fact from Beauforts on both sides."[3]

Edmund surrenders to Charles VII at Rouen in 1449. Illuminated page from the Anciennes chroniques d'Angleterre, Jean de Wavrin.[4]

Edmund received the county of Mortain in Normandy on 22 April 1427,[5] became a commander in the English army in 1431, and in 1432 was one of the envoys to the Council of Basel.[6] After his recapture of Harfleur and his lifting of the Burgundian siege of Calais, he was named a Knight of the Garter in 1436. After subsequent successes he was created Earl of Dorset on 28 August 1442 (though he seems to have been styled as such since around 1438)[7] and Marquess of Dorset on 24 June 1443.[8][9] During the five-year truce from 1444 to 1449 he served as Lieutenant of France. On 31 March 1448 he was created Duke of Somerset.[10] As the title had previously been held by his brother, he is sometimes mistakenly called the second duke,[11] but the title was actually created for the second time, and so he was actually the first duke, the numbering starting over again.

Somerset was appointed to replace York as commander in France in 1448. Somerset was supposed to be paid £20,000; but little evidence exists that he was. Fighting began in Normandy in August 1449. Somerset's subsequent military failures left him vulnerable to criticism from York's allies.[12] The most humiliating moment was when Somerset surrendered Rouen, the capital of Normandy, to the French without even a token siege. He failed to repulse French attacks, and by the summer of 1450 nearly all the English possessions in northern France were lost, with Normandy having fallen after the Battle of Formigny and Siege of Caen. By 1453 all the English possessions in the south of France were also lost, and the Battle of Castillon ended the Hundred Years War.

The fall of the duke of Suffolk left Somerset the chief among King Henry VI's ministers, and the Commons in vain petitioned for his removal in January 1451.[6] Power rested with Somerset and he virtually monopolised it, with Margaret of Anjou, wife of King Henry, as one of his principal allies. It was also widely suspected that Somerset had an extra-marital affair with Margaret. After giving birth to a son in October 1453, Margaret took great pains to quash rumours that Somerset might be his father. During her pregnancy Henry suffered a mental breakdown, leaving him in a withdrawn and unresponsive state that lasted for one-and-a-half years. This medical condition, untreatable either by court physicians or by exorcism, plagued him throughout his life. During Henry's illness, the child was baptised Edward, Prince of Wales, with Somerset as godfather; if the King could be persuaded, he would become legal heir to the throne.

Somerset's fortunes, however, soon changed when his rival York assumed power as Lord Protector in April 1454 and imprisoned him in the Tower of London. Somerset's life was probably saved only by the King's seeming recovery late in 1454, which forced York to surrender his office. Henry agreed to recognise Edward as his heir, putting to rest concerns about a successor prompted by his known aversion to physical contact; subsequently he came to view Edward's birth as a miracle.[13][14] Somerset was honourably discharged, and restored to his office as Captain of Calais.

By now York was determined to depose Somerset by one means or another, and in May 1455 he raised an army. He confronted Somerset and the King in an engagement known as the First Battle of St Albans, which marked the beginning of the Wars of the Roses. Somerset was killed in a last wild charge from the house where he had been sheltering. His son, Henry, never forgave York and Warwick for his father's death, and spent the next nine years attempting to restore his family's honour.

• Henry Beaufort, 3rd Duke of Somerset (26 January 1436 – 15 May 1464),[15] eldest son and heir, who was beheaded after the Battle of Hexham, where he commanded the Lancastrian troops. He died unmarried, but left an illegitimate son by his mistress Joan Hill:
  • Charles Somerset, 1st Earl of Worcester, 1st Baron Herbert (c.1460-1526), KG, who was given the surname "Somerset" and was created Baron Herbert in 1506 and Earl of Worcester in 1513. From him descend the Earls and Marquesses of Worcester and the present Dukes of Beaufort.
• Edmund Beaufort, 4th Duke of Somerset (1439 – 6 May 1471),[15] who succeeded his elder brother. He was executed two days after being defeated in the Battle of Tewkesbury, in which he commanded the van of the Lancastrian army, and was buried in Tewkesbury Abbey. Died unmarried, the last of the male line, when "the house of Beaufort and all the honours to which they were entitled became extinct".[16]
• John Beaufort, Earl of Dorset (1441[17] – 4 May 1471),[15] killed fighting for the Lancastrians during the Battle of Tewkesbury, two days before his elder brother's execution. Died unmarried.
• (Thomas Beaufort (1442–1517), another son identified by Alison Weir, but not by the traditional sources[18])

Following the death of all their brothers without issue, fighting for the Lancastrian cause, they became co-heiresses to their father, and their descendants were thus entitled to quarter the arms of Beaufort.

Arms of Cary, Viscount Falkland (extant family and title), quartering Spencer and Beaufort[19]

• Eleanor Beaufort (Countess of Ormond) (between 1431 and 1433 – 16 August 1501), who married firstly James Butler, 5th Earl of Ormond, and secondly Sir Robert Spencer (d. pre-1510), of London and Bridport, Dorset,[18] also of Ashbury in Devon;[20] frequently stated erroneously in credible sources[21] to be of Spencer Combe, Crediton, Devon. One of the two daughters and co-heiresses of Sir Robert Spencer by his wife Eleanor Beaufort was Margaret Spencer (1472–1536) (or Eleanor), who married Thomas Cary of Chilton Foliat in Wiltshire, the younger son of William Cary (1437–1471) of Cockington and Clovelly in Devon, whose descendants included Cary, Viscount Falkland; Cary, Baron Hunsdon; Cary, Baron Cary of Leppington, Earl of Monmouth; and Cary, Viscount Rochfort, Earl of Dover,[22] all of whom quartered the arms of Beaufort.
• Joan Beaufort (1433 – 11 August 1518), married firstly Robert St Lawrence, 3rd Baron Howth, and secondly Sir Richard Fry.[18][23]
• Anne Beaufort (1435 – 17 September 1496),[18][24] who married Sir William Paston (1436 – before 7 September 1496),[25] a younger son of William Paston (1378–1444), Justice of the Common Pleas.[26]
• Margaret Beaufort, Countess of Stafford (1437–1474),[27][28] married firstly Humphrey, Earl of Stafford and secondly Sir Richard Darell, of Littlecote (in Ramsbury), Wiltshire.[15]
• Elizabeth Beaufort (1443 – before 1475),[29] married Sir Henry Fitz Lewis.[18]
• Mary Beaufort (born between 1431 and 1455)[18]