What would you call an internal ambassador in a monarchy?

The context: She is to relay business correspondence between the king and the countess, and generally represent the king and the countess to the subjugate nobles of the countess.

Maria2018-03-04T22:31:41Z

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If I understand correctly, I think the term you're looking for is courtier. At least in relaying correspondence. I'm not sure of the last part. Perhaps liaison.