After the 1.1 post detailing the new population changes, I commented that you guys seriously needed to look over the "royalty" history available for sovereigns. Having an ability that increased all prestige in all your cities by 100% (aka doubling it) is a serious balance issue. If it was overpowered before 1.09n, it's even more overpowered now. A dev replied and said that it would be changed.
In 1.09n beta this history has not changed. Please do not forget.