bezant vs hyperpyron

bezant

noun
  • A coin made of gold or silver, minted at Byzantium and used in currency throughout mediaeval Europe. 

  • The heraldic representation of a gold coin. 

hyperpyron

noun
  • A Byzantine coin in use during the late Middle Ages, replacing the solidus as the Byzantine Empire’s gold coinage. 

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