Caesar vs despot

Caesar

noun
  • A title of Roman emperors. 

  • A Bloody Caesar cocktail. 

  • An absolute ruler; an autocrat. 

name
  • An ancient Roman family name, notably that of Julius Caesar. 

  • The government; society; earthly powers. 

despot

noun
  • A ruler with absolute power; a tyrant. 

  • A title awarded to senior members of the imperial family in the late Byzantine Empire, and claimed by various independent or semi-autonomous rulers in the Balkans (12th to 15th centuries) 

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