An "over-king" refers to a ruler who holds authority over other kings or regional leaders. This title often implies a hierarchical structure where the over-king has the power to govern or influence multiple territories, typically in a feudal or tribal system. The concept can be seen in various historical contexts, such as in ancient Britain or during the Viking Age. Over-kings were responsible for maintaining order and providing protection to their vassals or subordinate kings. They often commanded loyalty through military strength or political alliances. This system allowed for a more organized governance structure, enabling the over-king to manage larger areas and diverse populations effectively.