The document summarizes key historians and developments in Greek, Roman, and Western historiography. It discusses Herodotus and Thucydides as two of the first historians and their different approaches. It then covers historians from the Hellenistic period like Polybius and their styles. Roman historians discussed include Livy, who wrote a history of Rome from its founding, and Tacitus, a writer on the late Roman Empire. The document also summarizes characteristics of Christian, Medieval, and Renaissance historiography and their developments.