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Tiberius was not a popular figure in his time and his portrayal by historians such as Tacitus portrayed him as a gloomy tyrant. He was more than this. Tiberius was one of the most important military commanders during a critical time. He expanded the Empire and helped to secure its frontiers for many decades. Tiberius as the second Emperor did much to strengthen the Imperial office by promoting the cult of the Emperor and by ensuring the Senators were subordinate to Primus Princeps. He was also a talented administrator who reformed the civil service and the Imperial fiscal system. However, his transfer of power to Sejanus was unforgivable and he left Rome to the mercy of a tyrant and this detracts from his reputation for providing good government. Tiberius treatment of the Senate and his treason laws were an important step away from the system developed by Augustus. The second Emperor helped not only to strengthen the position of the Emperor but he also made it more autocratic.