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
Dependents and Guests
This amalgamation of two substantially similar commonwealths produced rather an increase in the size than a change in the intrinsic character of the existing community. A second process of incorporation, which was carried out far more gradually and had far deeper effects, may be traced back, so far as the first steps in it are concerned, to this epoch; we refer to the amalgamation of the burgesses and the μέτοικοι.
At all times there existed side by side with the burgesses in the Roman community persons who were protected, the "listeners" (-clientes-), as they were called from their being dependents on the several burgess-households, or the "multitude" (-plebes-, from -pleo-, -plenus-), as they were termed negatively with reference to their want of political rights.(1)
1. I. V. Dependents of the Household
The elements of this intermediate stage between the freeman and the slave were, as has been shown(2) already in existence in the Roman household: but in the community this class necessarily acquired greater importance -de facto- and -de jure-, and that from two reasons.
2. -Habuit plebem in clientelas principium descriptam-. Cicero, de Rep. ii. 9.
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Reference address : https://www.ellopos.net/elpenor/rome/1-06-burgesses-reformed-constitution.asp?pg=4