Appian of Alexandria Civil Wars 2.1.4

[4] Such were the designs of Lentulus, Cethegus, Statilius, and Cassius, the chiefs of the conspiracy, and they waited for the appointed time. Meanwhile ambassadors of the Allobroges, who were in the city making complaint against their magistrates, were solicited to join the conspiracy of Lentulus in order to cause an uprising against the Romans in Gaul. Lentulus sent in company with them, to Catiline, a man of Croton named Vulturcius, who carried letters without signatures. The Allobroges being in doubt communicated the matter to Fabius Sanga, the patron of their state—it was the custom of all the subject states to have patrons at Rome. Sanga communicated the facts to Cicero, who captured the Allobroges and Vulturcius on their journey and brought them straightway before the Senate. ¹ They confessed to their understanding with Lentulus and testified in his presence that Cornelius Lentulus had often said that it was written in the book of fate that three Cornelii should be monarchs of Rome, two of whom, Cinna and Sulla, had already been such.