A king who already owns all the land of the nation, why would he grant his land to others? Isn't it better to keep it for himself?
Actually, this understanding is wrong.
The real form of feudalism is like this:
A king looks into the distance, pats a vassal on the shoulder, and says: Zhang the Third, go three thousand kilometers in that direction. I don't know what's there, and I don't know what that place is like, but anyway, I'll entrust that land to you. Take your army and go on an expedition there! When you dispatch your troops, I'll give you some support, some supplies, and the like.
If you conquer that place, you can establish your territory there, as long as you openly continue to acknowledge me as your lord and pay me a symbolic tribute each year. That's enough.
——This is real feudalism.
Real feudalism is not about ceding already owned land to subordinate vassals.
It is about sending expeditionary forces to distant, unknown, unconquered, and unruly lands.
