Margaret Holland
Countess of Somerset; Duchess of Clarence
Spouse	John Beaufort, 1st Earl of Somerset m. c. 1399; dec. 1410 Thomas of Lancaster, 1st Duke of Clarence m. 1411; dec. 1421
Issue
Henry Beaufort, 2nd Earl of Somerset John Beaufort, 1st Duke of Somerset Thomas Beaufort, Earl of Perche Joan Beaufort, Queen of Scotland Edmund Beaufort, 1st Duke of Somerset Margaret Beaufort, Countess of Devon
Father	Thomas Holland, 2nd Earl of Kent
Mother	Alice Fitzalan
Born	1385
Died	30 December 1439 (aged 54)
Burial	Canterbury Cathedral, Kent

Margaret Beaufort, Countess of Somerset (née Holland; 1385–30 December 1439) was the daughter of Thomas Holland, 2nd Earl of Kent, who was the son of Joan "the Fair Maid of Kent" (granddaughter of Edward I of England, wife of Edward the Black Prince and mother of Richard II of England). Margaret's mother was Alice Fitzalan, daughter of Richard Fitzalan, 10th Earl of Arundel and Eleanor of Lancaster.

Margaret married John Beaufort, 1st Earl of Somerset, son of John of Gaunt, 1st Duke of Lancaster and his mistress Katherine Swynford. They had six children:

• Henry Beaufort, 2nd Earl of Somerset (c. 1401–25 November 1418).
• John Beaufort, 1st Duke of Somerset (baptized 25 March 1404–27 May 1444).
• Thomas Beaufort, Earl of Perche (c. 1405–1432).
• Joan Beaufort (c. 1406–15 July 1445), who married James I of Scotland and Sir James Stewart, the Black Knight of Lorn.
• Edmund Beaufort, 1st Duke of Somerset (c. 1406–22 May 1455).
• Margaret Beaufort, Countess of Devon (c. 1409–1449). Married Thomas de Courtenay, 13th Earl of Devon.

After Beaufort died in 1410 (in the Tower of London), she married his nephew Thomas of Lancaster, 1st Duke of Clarence, the son of King Henry IV. They had no children. Margaret and both her husbands are buried together in a carved alabaster tomb in Canterbury Cathedral that shows her lying between the two of them.

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