Charles Brandon, 1st Duke of Suffolk, 1st Viscount Lisle, PC (c.1484 22 August 1545) was an English military leader and courtier. Through his third wife, Mary Tudor, he was brother-in-law to King Henry VIII.

Mary Tudor (; 18 March 1496 – 25 June 1533) was an English princess who was briefly queen of France. She was the younger surviving daughter of King Henry VII of England and Elizabeth of York, and the third wife of Louis XII of France, who was more than 30 years older than her.

Following Louis's death, she married Charles Brandon, 1st Duke of Suffolk. Performed secretly in France, the marriage occurred without the consent of Mary's brother, Henry VIII. The marriage necessitated the intervention of Thomas Wolsey; Henry eventually pardoned the couple, after they paid a large fine. Mary's second marriage produced four children. Through her older daughter, Frances, she was the maternal grandmother of Lady Jane Grey the de facto queen of England for nine days in July 1553.