bezant vs sou

bezant

noun
  • The heraldic representation of a gold coin. 

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

sou

noun
  • An old French copper coin equal to one twentieth of a livre or twelve deniers; one sou is to the livre as one shilling is to the pound. 

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