I think the trait name is "Intrigued By Cataphracts", hey I tried it too as it is that tough but the cheat don't work, Iam already in 203 bc I di the following:

`
then Rome Shell open
I type:

give_trait "character's name" trait
but then I read Character doesn't found, something I cannot understand as some other cheats works like add money or process_cq, is there anyone that can help?