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In studying the political, administrative, legislative, and dynastic records of extinct civilizations, modern historians must bring to bear all the evidence at their disposal; and such evidence may vary sharply from one locality and period to another. Historiography in the modern sense—the analytical ordering and interpretation of past institutions and events—is an invention of ancient Greece, and even there it only gradually eschewed the fantastical. In many early societies (e.g., Mesopotamia, Egypt), chronographic records were either annalistic or legendary in kind and sometimes apologistic or propagandistic in purport; and in others (e.g., India) a cyclical world view prevailed, and a lack of feeling for linear time depth precluded an ordered appreciation of the past, leaving only legendry—in such cases only synchronisms with time-anchored events elsewhere allow a precise dating.

Thus, the amount of predigested ancient information bearing on antecedent events may vary from sophisticated literary to scrupulous epigraphic or may be wholly lacking or largely valueless. In the latter instances the historian is almost exclusively dependent for native information on primary documents, and such documents are in most cases inscriptional.