What is the person called that makes a king or queen laugh?

There isn't a specific word for someone who makes a king or queen laugh. However, depending on the context, you could use terms like:

* Jester: This is the classic and most common term. Jesters were court entertainers who used humor, acrobatics, and other skills to entertain the royal family.

* Court Fool: Similar to jester, but often implying a more satirical or critical type of humor.

* Humorist: A general term for someone who is good at telling jokes or making people laugh.

* Comedian: A professional entertainer who uses humor to entertain an audience.

* Entertainer: A broad term that could encompass a variety of skills, including humor.

The best term to use will depend on the specific situation and the type of humor the person uses.