Death vs pale rider

Death

name
  • The personification of death, often a skeleton with a scythe, and one of the four horsemen of the apocalypse. 

pale rider

noun
  • Death, the Grim Reaper or angel of death; and one of the Four Horsemen of the Apocalypse. 

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