[1] Violation by the host of the duties of hospitality was likely to provoke the wrath of the gods; but it does not appear that anything beyond this religious sanction existed to guard the rights of a traveler.
[tone] Amongst the Romans, private hospitality, which had existed from the earliest times, was more accurately and legally defined than amongst the Greeks, the tie between host and guest being almost as strong as that between patron and client.
The advantages thus obtained by the guest were, the right of hospitality when traveling and, above all, the protection of his host (representing him as his patron) in a court of law.
We find the office mentioned in a Corcyraean inscription dating probably from the 7th century BC, and it continued to grow more important and frequent throughout Greek history.
These consisted partly in the general respect and esteem paid to a proxenus, and partly in many more substantial honors conferred by special decree of the state whose representative he was, such as freedom from taxation and public burdens, the right of acquiring property in Attica, admission to the senate and popular assemblies, and perhaps even full citizenship.
[1] A full bibliography of the subject will be found in the article in Daremberg and Saglio, Dictionnaire des antiquités, to which may be added Rudolf von Jhering.