Shahan Shah !

Hi EB team :smiley:
I'm playing a campaign with Pahlava and After I took the whole Iran and when I captured Babylon ,The adviser appeared with a message which in brief told me that I'm "Shahan Shah of Iran" now ! Then I immediately checked my faction leader for this new title ,But unfortunately saw that still his title is "Shahrdar" :sad: So I don't now whether I gussed wrong And Pahlava faction leader never gets this trait or He gets this trait but this is a bug or I need to do something more in order to get "Shahan Shah" title for my faction leader ?!

Thanks beforehand