Thucydides, the patron saint of Realpolitik, continues to be read in many fields outside of classics. Why did his History succeed in setting the pattern for future scholars where Hereodotus's earlier failed? In this fascinating study of the construction of intellectual authority, Gregory Crane argues that Thucydides was successful for two reasons. First, he refined the language of administration: Who was in charge? How much money was spent? How many people were killed? Second, he drew upon the abstract philosophical rhetoric developing in the fifth century, one in which the state and the public, rather than the family and the individual, stand at the center of the world. Ironically, it was through deeply personal alliances that aristocratic Greeks had defined themselves and exerted power. Thucydides's discursive practice was therefore fundamentally incompatible with his ideological goals.