Description of Greece
Pausanias
Pausanias. Pausanias Description of Greece, Volumes 1-4. Jones, W.H.S. (William Henry Samuel), translator; Ormerod, Henry Arderne, translator. London, New York: W. Heinemann, G.P. Putnam's Sons, 1918-1935.
While he was carrying out his instructions, the Athenian populace sacked Oropus, a state subject to them. The act was one of necessity rather than of free-will, as the Athenians at the time suffered the direst poverty, because the Macedonian war had crushed them more than any other Greeks. So the Oropians appealed to the Roman senate. It decided that an injustice had been committed, and instructed the Sicyonians to inflict a fine on the Athenians commensurate with the unprovoked harm done by them to Oropus.