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Trajan was an able administrator and, unlike his predecessors, respected the constitution and Rome's laws. Trajan enacted some laws that improved the status of slaves, and it became illegal for masters to abandon old slaves. He forbade the use of informers, and there were no treason trials during his years in power. Trajan did not rule as an autocrat like so many of his predecessors.<ref>Pliny the Younger, Letter 10. 68</ref> It has been stated that he gave the Empire its longest period of stability and good government in its history.<ref>Bennet, p. 10</ref>

Trajan has been acclaimed as a great Emperor, but he was also an egomaniac who loved war. Ultimately his actions seriously undermined the Empire. The truth is that Trajan had many achievements but also some glaring failures. His conquest expanded the Empire and generated new revenues for Rome, and improved its strategic position concerning its enemies.