Background
Through her mother she was a half-sister of Henry FitzRoy, 1st Duke of Richmond and Somerset, the only illegitimate child acknowledged by Henry VIII, King of England. Elizabeth was the only known daughter of Sir Gilbert Tailboys and his wife, also Elizabeth (née Blount). She also had a half-brother from her mother"s former relationship with Henry VIII: Henry FitzRoy, who was a year or two older than her.