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
His brother Attalus II Philadelphia (d. 616) with Roman aid repelled the attempt of Pharnaces king of Pontus to seize the guardianship of Eumenes' son who was a minor, and reigned in the room of his nephew, like Antigonus Doson, as guardian for life. Adroit, able, pliant, a genuine Attalid, he had the art to convince the suspicious senate that the apprehensions which it had formerly cherished were baseless.
The anti-Roman party accused him of having to do with keeping the land for the Romans, and of acquiescing in every insult and exaction at their hands; but, sure of Roman protection, he was able to interfere decisively in the disputes as to the succession to the throne in Syria, Cappadocia, and Bithynia. Even from the dangerous Bithynian war, which king Prusias II, surnamed the Hunter (572?-605), a ruler who combined in his own person all the vices of barbarism and of civilization, began against him, Roman intervention saved him--although not until he had been himself besieged in his capital, and a first warning given by the Romans had remained unattended to, and had even been scoffed at, by Prusias (598-600).
But, when his ward Attalus III Philometor ascended the throne (616-621), the peaceful and moderate rule of the citizen kings was replaced by the tyranny of an Asiatic sultan; under which for instance, the king, with a view to rid himself of the inconvenient counsel of his father's friends, assembled them in the palace, and ordered his mercenaries to put to death first them, and then their wives and children. Along with such recreations he wrote treatises on gardening, reared poisonous plants, and prepared wax models, till a sudden death carried him off.
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Reference address : https://www.ellopos.net/elpenor/rome/4-01-gracchi.asp?pg=91