Leonine verse vs leonine

Leonine verse

noun
  • A verse form based on internal rhyme, commonly used in Latin verse of the European Middle Ages. 

leonine

noun
  • A 13th-century coin minted in Europe and used in England as a debased form of the sterling silver penny, outlawed under Edward I. 

  • A kind of Latin verse, generally alternate hexameter and pentameter, rhyming at the middle and end. 

adj
  • Of, pertaining to, or characteristic of a lion. 

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