King-at-arms

the chief heraldic officer of a country. In England the king-at-arms was formerly of great authority. His business is to direct the heralds, preside at their chapters, and have the jurisdiction of armory. There are three principal kings-at-arms, viz., Garter, Clarencieux, and Norroy. The latter (literally north roy or north king) officiates north of the Trent.

See also: King

Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
References in classic literature ?
The head of it was the officer known to later centuries as Norroy King-at-Arms! The two other members were chiefs of bureaus in his depart- ment; and all three were priests, of course; all officials who had to know how to read and write were priests.
The Lord Lyon King-at-Arms and his decrepit court will dodder along in front.