bellarmine vs longbeard

bellarmine

noun
  • A stoneware jug of a pattern that originated around Cologne, Germany, in the 16th century, having a bearded face or mask supposed to represent Cardinal Bellarmine, a leader in the Counter-Reformation. 

longbeard

noun
  • Synonym of greybeard (“a bellarmine”) 

  • Synonym of greybeard (“an old man”) 

  • A man with a long beard. 

  • Synonym of greybeard (“experienced long-time member of a group”) 

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