Who was the former mistress of Henry VIII of England, who gave birth to Thomas Burgh, 3rd Baron Burgh?
Thomas Burgh, 3rd Baron Burgh Thomas Burgh, 3rd Baron Burgh KG ("c." 1558–14 October 1597) 3rd Baron Borough of Gainsborough, "de jure" 7th Baron Strabolgi and 9th Baron Cobham of Sterborough was the son of William Burgh, 2nd Baron Burgh and Lady Katherine Clinton, daughter of Edward Clinton, 1st Earl of Lincoln and Elizabeth Blount, former mistress of King Henry VIII. He was one of the peers who conducted the trial of the Duke of Norfolk in 1572.
Joan Beaufort, Countess of Westmorland Joan Beaufort, Countess of Westmorland (  1379 – 13 November 1440), was the fourth of the four children (and only daughter) of John of Gaunt, 1st Duke of Lancaster, and his mistress, later wife, Katherine Swynford. In her widowhood, she was a powerful landowner in the North of England.