What would be a good title for someone who works closely with an emperor, is skilled in diplomacy, deals with different factions and individuals in the Empire's capital city to resolve issues, while also negotiating with other nations on behalf of the Emperor?
Setting: Fantasy world loosely based in renaissance times. The Emperor's court consists of titles/persons such as: a commander of war, a Vaultmaster, a high priest, city patrol commander, etc.
For the person in question, I was thinking of the title of Ambassador, but an ambassador doesn't deal with domestic issues, do they? The term Diplomat comes to mind, but is there a higher ranking——and cooler sounding——title that I could give to this person?
Examples of what this person does on a regular day:
The poor in the slum districts of the capital are protesting, so our person/diplomat helps appease the district leaders by listening to their issues and coming up with solutions
A king from another nation is coming to speak of a potential alliance. This person/diplomat has to help the Emperor and said king to come to terms.