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Espionage and Treason in Classical Greece is written by André Gerolymatos and published by Bloomsbury Publishing USA. It's available with International Standard Book Number or ISBN identification 1978752512 (ISBN 10) and 9781978752511 (ISBN 13).
This history of ancient diplomacy demonstrates how the ancient Greeks used guest-friendship as a mechanism of diplomacy. Ancient proxenoi were the equivalent of contemporary consul-generals and they served some of the same purposes. The proxenoi conducted the diplomatic affairs of the state they represented and looked after the interests of the city-state that had adopted them. In times of war the proxenoi maintained spies and supplied intelligence on the movements of fleets and armies.