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
Perpetual civil wars, notwithstanding the Roman efforts to bring about peace, converted one flourishing township after another on the old "island of the hundred cities" into heaps of ruins. Its inhabitants roamed as robbers at home and abroad, by land and by sea; the island became the recruiting ground for the surrounding kingdoms, after that evil was no longer tolerated in the Peloponnesus, and above all the true seat of piracy; about this period, for instance, the island of Siphnus was thoroughly pillaged by a fleet of Cretan corsairs.
Rhodes--which, besides, was unable to recover from the loss of its possessions on the mainland and from the blows inflicted on its commerce(42)--expended its last energies in the wars which it found itself compelled to wage against the Cretans for the suppression of piracy (about 600), and in which the Romans sought to mediate, but without earnestness and apparently without success.
42. Cf. III. X. Intervention in the Syro-Egyptian War
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Reference address : https://www.ellopos.net/elpenor/rome/4-01-gracchi.asp?pg=115