First thing I did in Jade Dragon was look through the Tang dynasty family tree, and sure enough there she is, China's only female emperor : r/ CrusaderKings
Crusader Kings 2 Jade Dragon DLC Review - Fine China
Crusader Kings 2: Jade Dragon PC Review | GameWatcher
Crusader Kings 2: Jade Dragon adds China, an off-map empire that you don't want to piss off