Master jokingly refers to his home as a ‘Castle’ in the ‘Kingdom Of Mine’, his relatives as members of the ‘Royal Family’ and his authority as ‘Regal’, and while he doesn’t actually wear a ‘Crown’ he does own one, which is on display in the ‘Castle’ and must be respected by any House Boy when passing by.

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[2019 version not available online]

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Rule 176-M — Respecting The Crown 
Classified: Household Duties