After all, Henry was known to be impulsive, irritable, incredibly prone to go from one great idea to the other AND had terrible problems with concentration/distractability. One of the reasons that Britain was nearly bankrupt (at least according to Ronald Hutton's Brief History of Britain 1485 to 1666) was that Henry was absolutely incapable of finishing anything when it came to sticking with a project or doing fiddly admin. In fact, the only time where he was properly able and productive was when he was supported by Catherine of Aragon and Cardinal Wolsey, who were both non ADDers and would take his great ideas and put them into action.
Elizabeth I was just the same, with exactly the same problems regarding impulsivity, hyperactivity and distractability. She also had rage control problems and would go into horrific rages that she would forget all about a few minutes later.
As a historian, this thread made me literally lol. You have made my day, Jon. I do actually agree with your theory though, but it would be interesting when we consider that there is suggestion ADHD can be a genetic thing too. His father, Henry VII, didn't seem to have it and his mother, Elizabeth of York, isn't hugely well documented. Though of course, as is the case with some girls, she may have just managed it REALLY well and thus it escaped notice. But his other blood relatives, Richard III and Edward IV, certainly had something going on. Especially Richard III.