justiciar

noun6

1. •
   (historical) One who administers justice
2. •
   (historical) A high-ranking judicial officer of medieval England or Scotland.
3. •
   (historical) A justice: a high-ranking judge.
4. •
   (historical) A Chief Justiciar: the highest political and judicial officer of the Kingdom of England in the 12th and 13th centuries.
5. •
   (historical) Various equivalent medieval offices elsewhere in Europe.
6. •
   (rare) A justiciary: a believer in the doctrine (or heresy) that adherence to religious law redeems mankind before God.