The character of Princess Margaret is actually a composite of Henry's older sister, Margaret Tudor, and his younger sister, Mary Tudor. Margaret married the King of Scotland and Mary the King of France, Louis XII. When the French king died less than a year after their marriage, Mary did indeed marry Charles Brandon in secret.
Natalie Dormer, a natural blonde, dyed her hair brunette after learning she got the role of Anne Boleyn. She later found out that the Showtime executives had wanted her to keep the blonde and they sent her back to try to change the color again. After a botched hair dye job, she begged to keep her hair brunette to stay true to the real Anne Boleyn, and they ultimately accepted.
Time Periods by Season Season 1 covers 1518 - 1530 Season 2 covers 1532 - 1536 Season 3 covers 1536 - 1540 Season 4 covers 1540 - 1547
Jonathan Rhys Meyers refused to wear a fat suit or gain weight as the aging and portly Henry VIII for the final season.