Held sway is a phrase that implies influence, control, or dominance over something or someone. There are several synonyms for held sway that may be used interchangeably to convey the same meaning. Some of the synonyms for held sway include prevailed, ruled, dominated, commanded, governed, controlled, led, guided, regulated, and managed. These words can be used to describe a person or something that is in a position of authority or power and is able to exert a significant influence over others. Depending on the context in which it is used, each of these synonyms may be more appropriate than others.