Was Henry VIII's Tyranny the Result of a Brain Injury?

A new theory suggests that Henry VIII underwent a personality change as the result of a head injury he suffered while jousting.

He was unconscious for nearly two hours after falling from his horse. Although he recovered consciousness, he was a changed man after the accident, according to a History Channel documentary, "Inside the Body of Henry VIII." Once universally admired for his handsomeness, charm and athleticism, he became a paranoid, violent tyrant.

"[T]he incident, which ended his jousting career, aggravated serious leg problems which plagued him for the rest of his life, and may well have caused an undetected brain injury which profoundly affected his personality.... The programme focuses on the king's medical problems which grew worse in his later years, especially his ulcerated legs and his obesity."