proxeny
In Ancient Greece, an arrangement whereby a citizen (chosen by the city) hosted foreign ambassadors at his own expense, in return for honorary titles from the state.
historical
If there be near me now a man of the Achaians who dwelleth far up the Ionian sea, he shall not upbraid me: I have faith in my proxeny […]
Where it comes from
From Ancient Greek προξενία (proxenía) derived from πρόξενος (próxenos).
Adapted from the Wiktionary entry proxeny (CC BY-SA 4.0).