Knights -
a man who served his sovereign or lord as a mounted soldier in armor.
Manor - a unit of land, originally a feudal lordship, consisting of a lord's demesne and lands rented to tenants
Feudalism - the dominant social system in medieval Europe, in which the nobility held lands from the Crown in exchange for military service, and vassals were in turn tenants of the nobles, while the peasants (villeins or serfs) were obliged to live on their lord's land and give him homage, labor, and a share of the produce, notionally in exchange for military protection.
Vassals -
a holder of land by feudal tenure on conditions of homage and allegiance
Serfs - an agricultural laborer bound under the feudal system to work on his lord's estate
William the Conqueror - William I, usually known as William the Conqueror, was the first Norman King of England, reigning from 1066 until his death in 1087.
Eleanor of Aquitaine - Eleanor of Aquitaine was one of the wealthiest and most powerful women in western Europe during the High Middle Ages and a member of the Ramnulfid dynasty of rulers in southwestern France.