@ aem91

Yeah, just wait a while if they get the trait, you don't need the Parthians.

@ AntiochosMegas

The trait shows up as "Intrigued By Cataphracts", but the internal name is "ImpressedByCats".

If it says "character not found" - the internal names are often different from the names you see in the game. A guy named "Alexandros Pergamou Mysiakes" might be "Alexandros Pergamoumysiakes" for example. Try members of the Syriakos family, their ingame names are usually the same as internal names.