A more thorough explanation:

Le roy le veut

Le roy le veut is a phrase from Law French that means "the king wills it." It is used to show the king's or queen's approval of a public bill passed by Parliament. If a queen approves, the sentence is "la reine le veut."

When the king approves a public bill, the clerk will say "le roy le veut." For example, if Parliament passes a law to build a new hospital, and the king approves it, the clerk will say "le roy le veut" to show that the king wants the law to be passed.

On the other hand, if the king does not approve a bill, the clerk will say "le roy s'avisera," which means "the king will advise upon it." For example, if Parliament passes a law to raise taxes, but the king does not approve it, the clerk will say "le roy s'avisera" to show that the king needs more time to think about it.