grand master

noun

1. the head of a military order of knighthood, a lodge, fraternal order, or the like.
2. Also grand master, grand·mas·ter. Chess. International Grand Master.
3. Also grand·mas·ter. (lowercase) a person at the highest level of ability or achievement in any field.

noun

1. the title borne by the head of any of various societies, orders, and other organizations, such as the Templars or Freemasons, or the various martial arts