Trajan launched an invasion towards the east and successfully conquered Armenia and Mesopotamia, but large uprisings and a major revolt of the Jews put an end to his expansion.
Bouchard, Elsa. "Parthian Wars". The Literary Encyclopedia. First published 01 March 2010
[http://www.litencyc.com/php/stopics.php?rec=true&UID=11455, accessed 22 July 2014.]