What is the name of the dependency system based on land tenure?

This dependence will be called feudal. So in the Middle Ages, all lands belonged to certain feudal lords, in connection with which, the peasants were forced to work on this land and pay taxes to their master. Over time, this form of dependence developed very strongly on the territory of the Russian state, where this dependence turned the peasants practically into slaves who had a very narrow circle of rights.