Please note that Mommsen uses the AUC chronology (Ab Urbe Condita), i.e. from the founding of the City of Rome. You can use this reference table to have the B.C. dates
From: The History of Rome, by Theodor Mommsen
Translated with the sanction of the author by William Purdie Dickson
Quarrels between Achaeans and Spartans
The Achaeans in particular, who, in their eagerness to round their territory, wholly failed to see how much it would have been for their own good that Flamininus had not incorporated the towns of Aetolian sympathies with their league, acquired in Lacedaemon and Messene a very hydra of intestine strife. Members of these communities were incessantly at Rome, entreating and beseeching to be released from the odious connection; and amongst them, characteristically enough, were even those who were indebted to the Achaeans for their return to their native land.
The Achaean league was incessantly occupied in the work of reformation and restoration at Sparta and Messene; the wildest refugees from these quarters determined the measures of the diet. Four years after the nominal admission of Sparta to the confederacy matters came even to open war and to an insanely thorough restoration, in which all the slaves on whom Nabis had conferred citizenship were once more sold into slavery, and a colonnade was built from the proceeds in the Achaean city of Megalopolis; the old state of property in Sparta was re-established, the of Lycurgus were superseded by Achaean laws, and the walls were pulled down (566).
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Reference address : https://www.ellopos.net/elpenor/rome/3-09-war-antiochus-asia.asp?pg=54