Heroic figures such as Heracles, Perseus, and Jason were seen by the Greeks not as mythical figures but as real people who in a bygone age traveled the world, settled new lands, and left descendants who, generation after generation, could trace their ancestry back to the "time of heroes." From the Homeric age to Byzantium, peoples and nations sharing the same fictive ancestry appealed to their kinship when forging military alliances, settling disputes, or negotiating trade connections. In this intriguing study of the political uses of perceived kinship, Christopher Jones gives us an...