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History of the Agora The excavations of the Athenian Agora have uncovered about thirty acres on the sloping ground northwest of the Acropolis (Fig. 3). Material of all periods from the Late Neolithic to ... These are mostly chamber tombs, with multiple burials. ... Hard times began in the 3rd century, when the city was destroyed by northern invaders, the Herulians, in A.D. 267.