Alderman

An alderman is a member of a municipal assembly or council in many jurisdictions founded upon English law. The term may be titular, denoting a high-ranking member of a borough or county council, a council member chosen by the elected members themselves rather than by popular vote, or a council member elected by voters.[1]

The title is derived from the Old English title of ealdorman, literally meaning "elder man", and was used by the chief nobles presiding over shires.

See the Wikipedia page