archon vs reigner

archon

noun
  • A ruler, head of state or other leader. 

  • A person who claims the right to rule, or to exercise power or sovereign authority over other human beings. 

  • A supernatural being subordinate to the Demiurge. 

  • A chief magistrate of ancient Athens. 

reigner

noun
  • One who reigns; a ruler. 

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