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
Similar consequences to some extent were produced by the exercise of the -ius hospitii-, in so far as by virtue of it foreigners settled permanently in Rome and established a domestic position there. In this respect the most liberal principles must have prevailed in Rome from primitive times.
The Roman law knew no distinctions of quality in inheritance and no locking up of estates. It allowed on the one hand to every man capable of making a disposition the entirely unlimited disposal of his property during his lifetime; and on the other hand, so far as we know, to every one who was at all entitled to have dealings with Roman burgesses, even to the foreigner and the client, the unlimited right of acquiring moveable, and (from the time when immoveables could be held as private property at all) within certain limits also immoveable, estate in Rome.
Rome was in fact a commercial city, which was indebted for the commencement of its importance to international commerce, and which with a noble liberality granted the privilege of settlement to every child of an unequal marriage, to every manumitted slave, and to every stranger who surrendering his rights in his native land emigrated to Rome.
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Reference address : https://www.ellopos.net/elpenor/rome/1-06-burgesses-reformed-constitution.asp?pg=7