Fact: Cenred's kingdom has no name. Cenred's kingdom needs no name.
Fact: Mercia is Bayard's kingdom.
Spec: I think Camelot is the realm itself, not just the citadel. Albion is the collective name for the whole isle but is not in general usage; if referenced at all, it's in a legendary sense. Unification seems to be a recent concept.
As for etiquette and protocol, make shit up. If you went by today's standards, then Uther should be the only one addressed as 'Sire' while other male nobles like Arthur would be 'Sir'. Knights should only get 'Sir' and not 'My Lord'. But the show's so inconsistent you might as well go with your instincts.
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Fact: Mercia is Bayard's kingdom.
Spec: I think Camelot is the realm itself, not just the citadel. Albion is the collective name for the whole isle but is not in general usage; if referenced at all, it's in a legendary sense. Unification seems to be a recent concept.
As for etiquette and protocol, make shit up. If you went by today's standards, then Uther should be the only one addressed as 'Sire' while other male nobles like Arthur would be 'Sir'. Knights should only get 'Sir' and not 'My Lord'. But the show's so inconsistent you might as well go with your instincts.