valiance vs valour

valiance

noun
  • The quality of being valiant; heroism, bravery or valour. 

valour

noun
  • Strength of mind in regard to danger; the quality which enables a person to encounter danger with firmness 

  • Individually sustained verve or passion. 

  • Value; worth. 

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