The lex Cassia de senatu was a Roman law, introduced in 104 BC by the tribune L. Cassius Longinus.[1] The law excluded from the senate individuals who had been deprived of imperium by popular vote[2][3] or had been convicted of a crime in a popular assembly (Judicium Populi).[4][5]
The law was a move to restrain the discretionary power of the Senate.[6] It was seen as reinforcing the voice of the Roman people.[7] The provision on magistrates stripped of their imperium was a deliberate attack against Quintus Servilius Caepio, proconsul in 105 BC, whose imperium was removed after the disaster of Arausio.[8]