A more thorough explanation:

Definition: The Assizes de Jerusalem was a set of feudal laws created in the 12th century after the Crusaders conquered Jerusalem in 1099. It was intended to be the law of the lands that were conquered by the Crusaders.

Example: The Assizes de Jerusalem was used to govern the Kingdom of Jerusalem, which was established after the First Crusade. The laws were based on feudalism, which was a system of government where lords owned the land and peasants worked on it.

Explanation: The example illustrates how the Assizes de Jerusalem was used to govern a specific territory, the Kingdom of Jerusalem. It also shows how the laws were based on the feudal system, which was a common form of government during the Middle Ages.