Simple English definitions for legal terms
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A feud or fief is a piece of land that a lord gives to a vassal in exchange for loyalty and military service. The Latin word for feud is "feudum" and it is where we get the word "feudal". There were different types of fiefs, such as a knight's fief (feudum militare) which was held by knight-service and was the most honorable type of tenure. Another type was a burgage fief (feudum burgale) which was given in exchange for a tenant's watching and warding in a burgh.
Definition: Fief d'Haubert is a type of feudal land tenure where the tenant was required to appear fully armed when summoned by the lord. It was a military service that was held by knight-service and was considered the most honorable species of tenure.
Example: A lord grants a fief d'Haubert to a knight, who is required to appear fully armed when summoned by the lord. The knight owes military service to the lord and must fight for him in times of war.
This example illustrates the definition of fief d'Haubert as a type of feudal land tenure that required military service from the tenant. The knight was obligated to appear fully armed when summoned by the lord, and this service was considered the most honorable form of tenure.