What is the leader of a royal city called Like the leader of a country would be a king what would the ruler of a city within the king's country be called?

The leader of a royal city within a kingdom is often referred to as a "mayor" or "governor," depending on the specific governance structure. In some historical contexts, especially in feudal systems, they might also be called a "lord" or "duke," particularly if they hold a noble title. The exact title can vary based on the culture and time period.