challenge: What is the possible meaning of Dúghall of Lorne being styled Petri in some sources?
  
  A. That his father was a lord of the diocese of Argyll
  B. That he was a ballie of the abthen of Dull
  C. That his father's name was Peadar or Peter, which was an unusual name in Scotland at the time
  D. That he was a member of the MacDúghaill kindred
  Answer: 