A fortified castle of stone, held by a lord and garrisoned by his knights
A walled town whose citizens had bought their rights and liberties from a lord
A lord's estate of his own land, peasant holdings and usually a village✓Correct answer
A district governed directly by a bishop on behalf of the Church
Explanation
The word describes a working unit of land rather than a building: the fields the lord kept for himself, the holdings the peasants had from him, and the settlement whose households worked both. A castle is the picture that misleads, because a lord might well own one, yet plenty of these estates had no fortification at all and a single lord could hold several of them scattered across a country.