Okay kiddo, so a judge is a person who makes decisions in a court. Just like how you make decisions about what you want to wear or what game you want to play, a judge makes decisions about things like who is right or wrong in a problem or what punishment someone deserves for doing something wrong.
Now, a "judge royal" is a term that was used a long time ago to refer to a special kind of judge. This type of judge had a lot of power and authority because they were appointed by the king or queen of the kingdom. They were called "royal" judges because they worked for the royal family.
The job of a judge royal was to make sure that the king's laws were being followed and that people were being treated fairly. They would travel around to different parts of the kingdom and hold court sessions where they would listen to cases and make decisions.
Judge royals were very important people and were often seen as being very wise and powerful. They would wear special robes and sit on a high chair called a "throne" to show everyone that they were in charge.
So, that's what a judge royal is all about. They were judges who worked for the king or queen and had a lot of power and authority.