Re: It's been mentioned
I've given some thought to this, and the more I consider it, the more I have come to prefer "Your Majesty".
I have a friend who, when completing online forms, likes to choose a pronoun outside of the usual Miss/Mrs/Mr. Typically they go for either Prof or Rev. Not because they are one but because they are gender neutral. And it makes little difference to the website they are registering to in most cases.