caesar vs drighten

caesar

noun
  • emperor, ruler, dictator 

  • Any agaric mushroom of the genus Amanita, section Amanita sect. Caesareae. 

drighten

noun
  • A lord; ruler; sovereign; chief; leader; prince. 

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