Short answers, pulled from the story.
Charles Brandon (c. 1484 - the 22nd of August 1545) was an English military commander and courtier who served as the closest companion of King Henry VIII for roughly forty years. He was created Duke of Suffolk on the 4th of March 1514 and held senior offices including Master of the Horse and Earl Marshal of England.
Charles Brandon and Mary Tudor had been in love before her arranged marriage to King Louis XII of France. When Louis died in early 1515, Brandon was sent to escort Mary home, but she persuaded him to break his promise to Henry VIII not to propose. They wed secretly at the Hotel de Clugny on the 3rd of March 1515, with Francis I among the ten witnesses.
Marrying a royal princess without consent was technically treason, and the privy council called for Brandon's imprisonment or execution. He and Mary escaped with a heavy fine of £24,000 payable at £1,000 a year, plus the return of Mary's full dowry of £200,000 and her plate and jewels. Henry later reduced the fine, and the couple were publicly remarried at Greenwich Hall on the 13th of May 1515.
Brandon's two sons by Katherine Willoughby, Henry Brandon, 2nd Duke of Suffolk, and Charles Brandon, 3rd Duke of Suffolk, both died of the sweating sickness on the 14th of July 1551, within an hour of each other. They were children when their father died in 1545.
Brandon's daughter Frances Brandon, born on the 16th of July 1517, married Henry Grey, 1st Duke of Suffolk, and became the mother of Lady Jane Grey. Jane Grey briefly held the English throne before being deposed and later executed.
Henry Cavill portrayed Charles Brandon in the Showtime series The Tudors. The series incorrectly shows Brandon married to Margaret Tudor rather than Mary Tudor, and fictionalises several of his relationships and storylines for dramatic purposes.