A convergence of land and language (3500-550 BCE) -- Iran and the Greeks (550-247 BCE) -- Parthians, Sasanians, and Sogdians (247 BCE-651 CE) -- The Iranization of Islam (651-1027) -- The Turks: empire-builders and champions of Persian culture (1027-1722) -- Under Europe's shadow (1722-1925) -- Modernization and dictatorship: the Pahlavi years (1925-79) -- The Islamic republic of Iran (1979-present).