You might want to check with the leadership of your city as to what the state of relations between Mercinae and Parrius actually is. My opinion is that largely relations are fairly good at the moment.
My opinion isn't really needed in this situation however, history tells us that whatever you think Mercinae's position is? it isn't!
Just a little observation!
Written by my hand on the 26th of Hindyear, in the year 1102.