king of kings vs thearch

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 

thearch

noun

  • The ruler of a thearchy, a monarch of gods 

  • The emperors (皇帝) of China, particularly the five legendary ones (五帝) of Chinese prehistory 

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