high king vs king of kings

high king

noun
  • A chief king or ruler; a great, superior, or supreme king; a king of kings; 

  • God. 

king of kings

noun
  • A king who has other kings as subjects; an emperor. 

name
  • Jesus Christ. 

  • The title of an individual king who has other kings as subjects; in particular 

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