Trajan issued many coins that referenced particular conquests. I tell a short version of the story of this Parthian conquest here: http://augustuscoins.com/ed/types/ARMENIA.html which I posted today after acquiring this coin recently: Quite a few hours of research later, I had that small web page ready to go. Ancient coins tell stories and doing the research to find and tell the story is a big part of the hobby for me. I think every ancient coin is interesting, but some are more interesting than others. Take a look (the same URL again): http://augustuscoins.com/ed/types/ARMENIA.html Show us a coin related to a conquest of Trajan!