The Laws of Gods and Men - S4-E6
Corrected entry: After Davos has introduced Stannis with all his proper titles at the Iron Bank of Braavos, the clerk wrongly uses the title "Protector of the Realm" for Tommen. However Tommen doesn't bear this title because he is not old enough yet. Protector of the Realm at that time is Tywin Lannister.
Correction: It's an understandable character mistake. Braavos residents don't use titles like Westeros, and the clerk is simply repeating all the titles that Davos recited, and probably just believes whoever sits on The Iron Throne is the recipient of all the titles.
rswarrior