The lex Caecilia Didia was a law put into effect by the consuls Q. Caecilius Metellus Nepos and Titus Didius in the year 98 BC.
[6] The second provision of the lex Caecilia Didia forbade leges saturae, "stuffed" laws, which were statutes dealing with heterogeneous subject matters.
Most significantly, in 91 BC the consul Lucius Marcius Philippus, in his capacity as an augur, managed to have the laws of the tribune Marcus Livius Drusus the Younger abrogated on the grounds that they contravened the second provision of the lex Caecilia Didia.
However, the radical nature of these bills and the forcible methods Saturninus and Glaucia used in ensuring their passage alienated a large part of the Roman people and eventually even Marius.
The goal was to curb the passage of radical bills, with the assumption that the period of trinundium would give the citizens time to understand the proposed law or to be persuaded to vote against it.