:Since you ask, and for what it's worth — very little, I fear, since the minute something gets controversial I just go away — that seems reasonable to me. I believe some of the royalty biographies do just that, even going so far as to list, in a special section, the various styles thru the life of the person. It still seems like a bit of overkill (read, really: excess column-inches devoted to the matter), but as they say, Wikipedia is not print, and disk storage is cheap. I would except current monarchs; Elizabeth II, by my lights, quite properly starts with "Her Majesty". 

 :The use of "His/Her Majesty" in relation to a dead person by the way, in addition to not being customary, is also inaccurate: ''Le Roi est mort: Vive le Roi !" is usually the official view of the monarchies themselves: the Majesty resides in the living Monarch, not elsewhere. Anyhoo, nobody should look to me for support, and I'll leave to others the time spent on such things.