During Sulla's proscription, Catulus avenged the death of his father with the assistance of Catiline, who tortured and killed Marcus Marius Gratidianus at the tomb of the senior Catulus.
During Sulla's persecution, Catulus avenged his father's death with the help of Catiline, who carried out a brutal act against Marcus Marius Gratidianus at the elder Catulus' burial site.