What is a under king?

Answer 1

An underking is a term that typically refers to a subordinate or lesser king, often ruling over a specific region or territory within a larger kingdom. This title may be used in historical or fantasy contexts to describe a ruler who operates under the authority of a more powerful king or monarch. In some cases, underkings may have certain autonomous powers but ultimately owe allegiance to the higher king. The concept can be found in various cultures and mythologies.