In the medieval social hierarchy, the two groups that could receive land were IMPORTANT NOBLES and VASSALS.
Since the King owns, he is the only one that can grant people land ownership. The King grants lands to important nobles in return of their pledge of loyalty and to be of service to him and to protect him at all cost.
The King also grants lands on his vassals. They are the less powerful military men or knights. They also pledge their allegiance to the king and serve in his army.