Virgilian vs belletristic

Virgilian

adj
  • Of or pertaining to Virgil (Roman writer) 

belletristic

adj
  • Of, pertaining to, or having the characteristics of belles-lettres. 

  • Written or appreciated for aesthetic value rather than content 

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