A more thorough explanation:

CALEFAGIUM

calefagium (kal-i-fay-jee-uhm), n. Hist. A feudal right to take wood from the King's forest or the lord's estate.

Calefagium is a term used in history to describe a right that feudal lords had to take wood from the King's forest or their own estate. This right was often used to provide firewood for heating and cooking.

For example, if a lord had calefagium, they could go into the forest and cut down trees for firewood without asking permission from the King. This right was often granted as part of a feudal agreement between the lord and the King.

Another example would be if a lord had calefagium on their own estate. They could cut down trees on their land to use for firewood without having to pay for it or ask permission from anyone else.

These examples illustrate how calefagium was a valuable right for feudal lords, as it allowed them to have a reliable source of firewood without having to pay for it or ask permission from anyone else.