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
As early as 593 there existed in the capital a number of special establishments for the practice of Greek declamation. Several distinguished names already occur among these Roman teachers; the philosopher Panaetius has been already mentioned;(18) the esteemed grammarian Crates of Mallus in Cilicia, the contemporary and equal rival of Aristarchus, found about 585 at Rome an audience for the recitation and illustration, language, and matter of the Homeric poems.
18. Cf. IV. XII. Panaetius
It is true that this new mode of juvenile instruction, revolutionary and anti-national as it was, encountered partially the resistance of the government; but the edict of dismissal, which the authorities in 593 fulminated against rhetoricians and philosophers, remained (chiefly owing to the constant change of the Roman chief magistrates) like all similar commands without any result worth mentioning, and after the death of old Cato there were still doubtless frequent complaints in accordance with his views, but there was no further action. The higher instruction in Greek and in the sciences of Greek culture remained thenceforth recognized as an essential part of Italian training.
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Reference address : https://www.ellopos.net/elpenor/rome/4-12-nationality-religion-education.asp?pg=37