The importance of Cicero in the debate between Augustine of Hippo and Julian of Aeclanum has been extensively studied. This includes Augustine's and Julian's use of the Catilinarian speeches in their polemics against each other. In comparison the use of Sallust, the other classical authority on Catiline, especially by Julian of Aeclanum, has been neglected. This paper intends to remedy that situation. Textual evidence may be meagre: barely two literal citations in three of the extant fragments of Julian's writings. But Julian's use of these, also compared with Jerome's and Augustine's, and the way his use of Sallust is reflected in the rest of his extant writing and thought gives the impression that he may have been far more deeply influenced by Sallust than has hitherto been thought. The importance of Cicero in the debate between Augustine of Hippo and Julian of Aeclanum has been extensively studied. This includes Augustine's and Julian's use of the Catilinarian speeches in their polemics against each other. In comparison the use of Sallust, the other classical authority on Catiline, especially by Julian of Aeclanum, has been neglected. This paper intends to remedy that situation. Textual evidence may be meagre: barely two literal citations in three of the extant fragments of Julian's writings. But Julian's use of these, also compared with Jerome's and Augustine's, and the way his use of Sallust is reflected in the rest of his extant writing and thought gives the impression that he may have been far more deeply influenced by Sallust than has hitherto been thought.