Legal Definitions - ad jura regis

ad jura regis

Ad jura regis is a legal term that means "for the rights of the king." It refers to a writ that was used in the past to protect the holder of a royal benefice from being ejected by someone else.

If a person held a royal benefice, such as a piece of land or a position in the church, and someone else tried to take it away from them, they could use ad jura regis to protect their rights. For example, if a bishop was being threatened with removal from his position by a rival claimant, he could use ad jura regis to defend his right to the position.