Leges Genuciae (also Lex Genucia or Lex Genucia de feneratione) were laws passed in 342 BC by Tribune of the Plebs Lucius Genucius Aventinensis.
These laws covered several topics: they banned lending that carried interest, which soon was not enforced; they forbade holding two magistracies at the same time or within the next 10 years (until 332 BC); and lastly, they required at least one consul to be a plebeian.
[1][2][3] The first time both consuls were plebeian was in 172 BC.
[4][5] By then, that provision was the only one that continued to be enforced.
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