[2] Margaret was a 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).

[4] After her husband John Beaufort died in 1410, she married his half nephew Thomas of Lancaster, Duke of Clarence (1387–1421), the son of King Henry IV.

[4] In 1419 she travelled to Normandy with her sons to be with her husband there, leaving her daughters in the care of the Prioress of Dartford.

[6] She was an executrix of his will alongside executors John Colvylle of Neuton, Cambridgeshire, knight, and Henry Merston of Westminster, clerk.

[4] Margaret and both her husbands are buried together in a carved alabaster tomb in Canterbury Cathedral that she commissioned.