In an idle half hour this afternoon, I was playing with a " Who wants to be a Millionaire" quiz game on my new iPhone 6, and I had the question " How many kings called Henry has England had" There have, of course been 9 but that was marked wrong by the app !
So...should I complain to the apps owners, and risk being called a smarty-pants, or should I just fume in silence ?
Regnal numbers did not come in until the time of Edward III. Edward I was Edward FitzHenry, Edward II was Edward FitzEdward, but so was Edward III, hence the need to differentiate.