Prince Harry, while appearing to be close in age to Katherine (aged 16) and his brother Arthur (aged 15) in this show, was 11 years old when they married.
Arthur refers to Margaret Pole as Aunt. His mother although calling her aunt to her son refers to Margaret as cousin. Margaret was a cousin to them. Margarets husband was the first cousin of Henry VII (their mothers were half sisters) and Margaret and Elizabeth were first cousins as well as their fathers were brothers.
King Henry tells Queen Elizabeth that he sees the same spirit in Catherine that he sees in Elizabeth. Both Henry and Elizabeth were related to Catherine. She was their third and fourth cousin.
The historical events occur at the end of 1501.
This episode takes place from October to November 1501.