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
Nevertheless the number of the μέτοικοι was of necessity constantly on the increase and liable to no diminution, while that of the burgesses was at the utmost perhaps not decreasing; and in consequence the μέτοικοι necessarily acquired by imperceptible degrees another and a freer position. The non-burgesses were no longer merely emancipated slaves or strangers needing protection; their ranks included the former burgesses of the Latin communities vanquished in war, and more especially the Latin settlers who lived in Rome not by the favour of the king or of any other burgess, but by federal right.
Legally unrestricted in the acquiring of property, they gained money and estate in their new home, and bequeathed, like the burgesses, their homesteads to their children and children's children. The vexatious relation of dependence on particular burgess-households became gradually relaxed. If the liberated slave or the immigrant stranger still held an entirely isolated position in the state, such was no longer the case with his children, still less with his grandchildren, and this very circumstance of itself rendered their relations to the patron of less moment.
While in earlier times the client was exclusively left dependent for legal protection on the intervention of the patron, the more the state became consolidated and the importance of the clanships and households in consequence diminished, the more frequently must the individual client have obtained justice and redress of injury, even without the intervention of his patron, from the king.
A great number of the non-burgesses, particularly the members of the dissolved Latin communities, had, as we have already said, probably from the outset not any place as clients of the royal or other great clans, and obeyed the king nearly in the same manner as did the burgesses. The king, whose sovereignty over the burgesses was in truth ultimately dependent on the good-will of those obeying, must have welcomed the means of forming out of his own -proteges- essentially dependent on him a body bound to him by closer ties.
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Reference address : https://www.ellopos.net/elpenor/rome/1-06-burgesses-reformed-constitution.asp?pg=10