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
Any action at law for higher rates must have been refused, perhaps even judicial claims for repayment may have been allowed; moreover notorious usurers were not unfrequently summoned before the bar of the people and readily condemned by the tribes to heavy fines. Still more important was the alteration of the procedure in cases of debt by the Poetelian law (428 or 441).
On the one hand it allowed every debtor who declared on oath his solvency to save his personal freedom by the cession of his property; on the other hand it abolished the former summary proceedings in execution on a loan-debt, and laid down the rule that no Roman burgess could be led away to bondage except upon the sentence of jurymen.
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Reference address : https://www.ellopos.net/elpenor/rome/2-03-equalization-orders-aristocracy.asp?pg=30