armorial bearing vs cognizance

armorial bearing

noun
  • Heraldry that consists of a design or image depicted on a shield 

cognizance

noun
  • An emblem, badge or device, used as a distinguishing mark by the body of retainers of a royal or noble house. 

  • Notice or awareness. 

  • Jurisdiction. 

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