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When he is introduced in the story, and when he receives a new title, give the full title. If he's being introduced when he walks into an important event or a throne room, it's contextually approp...
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#4: Attribution notice removed
Source: https://writers.stackexchange.com/a/25964 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#3: Attribution notice added
Source: https://writers.stackexchange.com/a/25964 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
When he is introduced in the story, and when he receives a new title, give the full title. If he's being introduced when he walks into an important event or a throne room, it's contextually appropriate for other characters to give all his names and titles: _His Majesty the Emperor Don Luis Maria de Juan León._ If he's trying to impress someone in a genital-waving contest, he can announce (or have someone else announce) all his names, titles, and nicknames. For example, _Daenerys Targaryen, Queen of the Andals, the Rhoynar, and the First Men, Stormborn, Breaker of Chains, Mother of Dragons, the Unburnt, Khaleesi of the Great Grass Sea._ Don't overdo this or you'll end up boring the reader, or conversely if you overdo it on purpose the other characters can start adding gag titles like _Lover of Bacon, Rewinder of VCR Tapes, Spiller of Mojitos,_ etc. However, your character doesn't think of _himself_ by those lengthy names. He thinks of himself as Luis, or maybe Luisma if he thinks his wife's nickname is adorable. So in your narration he's _Luis,_ and the other characters can address him as _Don Luis_ or _Luisma_ or _Papí_ or whatever depending on who's speaking.