I am playing as a Japan Daimyo which basically is a vassal of Japan with the speciality that a Daimyo can declare war on and annex other Daimyos. However it is impossible to vassalise them, because they are a subject nation of Japan.
Now I noticed that I can release them as vassals after completely annexing them. Will this really make them my vassal (I doubt it considering that I am a subject nation myself) or will this make them independent from me again and "only" a vassal/Daimyo of Japan?
I always played under the assumption that a vassal cannot have vassals of his own, so I am a bit confused what will happen.
I would try it, but I am playing Ironman and don't really want to screw up my Achievement hunt for "The Chrysanthemum Throne".
Best Answer
I just tested this under the latest version of 1.9 on non-Ironman by playing as a Japanese daimyo, annexing another daimyo through console, and releasing them through the "Release Subjects" dialog. They remain your vassals, even after monthly/yearly ticks.