chief

Definition:

The term "chief" refers to the most powerful or most important leader of a particular group.

Examples of this include, "chief musician," "chief priest," and "chief tax collector." and "chief ruler."
It can also be used for the head of a specific family, as in Genesis 36 where certain men are named as "chiefs" of their family clans. In this context, the term "chief" could also be translated as "leader" or "head father."
When used to describe a noun, this term could be translated as "leading" or "ruling," as in "leading musician" or "ruling priest."