About the same time the proconsul Lucius Piso was murdered. I shall make the account of this murder as exact as possible by first reviewing a few earlier circumstances, which have a bearing; on the origin and motives of such deeds. The legion and the auxiliaries stationed in Africa to guard the frontiers of the Empire were under the proconsul's authority during the reigns of the divine Augustus and Tiberius. But in course of time Caligula, prompted by his restless temper and by his fear of Marcus Silanus, who then held Africa, took away the legion from the proconsul, and handed it over to a legate whom he sent for that purpose. The patronage was equally divided between the two officers. A source of disagreement was thus studiously sought in the continual clashing of their authority, and it was further developed by an unprincipled rivalry. The power of the legates grew through their lengthened tenure of office, and, perhaps, because an inferior feels greater interest in such a competition. All the more distinguished of the proconsuls cared more for security than for power.