Accordingly, it was no trifling or insignificant plan which Lentulus was cherishing, nay, it was decided to kill all the senators and as many of the other citizens as they could, to burn down the city itself
Edition :
Plutarch Lives VII: Demosthenes and Cicero, Alexander and Caesar, ed. E. H. Warmington, trans. Bernadotte Perrin (The Loeb Classical Library 99), Cambridge - London 1967 (first ed. 1919).
Notes :
Catilina left Rome after he tried to have Cicero killed - Cornelius Lentulus gathered the remaining pendants of Catilina and encouraged them to revolt. This was planned for the night of the Saturnalia.