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
Political Organizatin of the Insurrection - Opposition--Rome
While the leading state thus collected its energies in the prospect of the severe war impending, the insurgents had to solve the more difficult task of acquiring political organization during the struggle. In the territory of the Paeligni situated in the centre of the Marsian, Samnite, Marrucinian, and Vestinian cantons and consequently in the heart of the insurgent districts, in the beautiful plain on the river Pescara, the town of Corfinium was selected as the Opposition-Rome or city of Italia, whose citizenship was conferred on the burgesses of all the insurgent communities; there a Forum and a senate-house were staked off on a suitable scale.
A senate of five hundred members was charged with the settlement of the constitution and the superintendence of the war. In accordance with its directions the burgesses selected from the men of senatorial rank two consuls and twelve praetors, who, just like the two consuls and six praetors of Rome, were invested with the supreme authority in war and peace.
The Latin language, which was even then the prevailing language among the Marsians and Picentes, continued in official use, but the Samnite language which predominated in Southern Italy was placed side by side with it on a footing of equality; and the two were made use of alternately on the silver pieces which the new Italian state began to coin in its own name after Roman models and after the Roman standard, thus appropriating likewise the monopoly of coinage which Rome had exercised for two centuries.
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Reference address : http://www.ellopos.net/elpenor/rome/4-07-sulpician-revolution.asp?pg=22