In my paper I analyse the narrative of Livy about the Bacchanalia conspiracy. Our author, who is short with some events, dedicates twelve long chapters to this happening, that is, he regards it as important. In his report we can establish more different sources: the accounts of earlier historians, the decree of the senat (Senatus consultum de Bacchanalibus) and rumours. In spite of his loyalty to the traditional Roman religion, his decription is reliable.