Margaret Beaufort, Countess of Devon

Margaret Beaufort, Countess of Devon (c. 1409 – 1449)[citation needed] was an English noblewomen.

Margaret Beaufort was the second and youngest[2] daughter of John Beaufort, 1st Earl of Somerset (c. 1371 – 16 March 1410), by his wife Margaret Holland (c. 1385/6 – c. 1439/40), the daughter of Thomas Holland, 2nd Earl of Kent by his wife Alice Fitzalan.

Her father, John Beaufort, was an illegitimate son of John of Gaunt, 1st Duke of Lancaster (1340–1399), the third surviving son of King Edward III (1327–1377), by his mistress, later his third wife, Katherine Swynford.

Her sons were all killed or executed during the Wars of the Roses due to their strong adherence to the Lancastrian cause, and left no children, and thus the senior line of the Courtenays was extinguished.

Margaret Beaufort, Countess of Stafford, was the mother of Henry Stafford, 2nd Duke of Buckingham, and Margaret Beaufort, Countess of Richmond and Derby, was the mother of King Henry VII.