source for the political history of Trajan's rule. Besides this, Pliny the Younger's Panegyricus and Dio Chrysostom's orations are the best surviving contemporary sources. Both are adulatory perorations, typical of the High Imperial period, that describe an idealized monarch and an equally idealized view of Trajan's rule, and concern themselves more with ideology than with fact.

The 10th volume of Pliny's letters contains