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
Agrarian Laws - Colony of Capua - Transmarine Colonialization
It is true that the Italian domain question was in a certain sense settled. The agrarian law of Tiberius and even theallotment-commission still continued legally in force; the agrarian law carried by Gracchus can have enacted nothing new save the restoration to the commissioners of the jurisdiction which they had lost. That the object of this step was only to save the principle, and that the distribution of lands, if resumed at all, was resumed only to a very limited extent, is shown by the burgess-roll, which gives exactly the same number of persons for the years 629 and 639.
Gaius beyond doubt did not proceed further in this matter, because the domain-land taken into possession by Roman burgesses was already in substance distributed, and the question as to the domains enjoyed by the Latins could only be taken up anew in connection with the very difficult question as to the extension of Roman citizenship. On the other hand he took an important step beyond the agrarian law of Tiberius, when he proposed the establishment of colonies in Italy--at Tarentum, and more especially at Capua--and by that course rendered the domain-land, which had been let on lease by the state and was hitherto excluded from distribution, liable to be also parcelled out, not, however, according to the previous method, which excluded the founding of new communities,(12) but according to the colonial system.
12. Cf. IV. III. The Commission for Distributing the Domains
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Reference address : https://www.ellopos.net/elpenor/rome/4-03-revolution-gaius-gracchus.asp?pg=19