burgomaster vs justiciar

burgomaster

noun
  • The mayor, or head magistrate, of a town in the Netherlands, Belgium, Germany and certain other countries. 

justiciar

noun
  • Various equivalent medieval offices elsewhere in Europe. 

  • A Chief Justiciar: the highest political and judicial officer of the Kingdom of England in the 12th and 13th centuries. 

  • A high-ranking judicial officer of medieval England or Scotland. 

  • A justiciary: a believer in the doctrine (or heresy) that adherence to religious law redeems mankind before God. 

  • A justice: a high-ranking judge. 

How often have the words burgomaster and justiciar occurred in a corpus of books? (source: Google Ngram Viewer )