Patrick Flemming, an Irish Highwayman who held Sway near the Bog of Allen and,
after numerous Murders, was executed on 24th of April, 1650 per The Complete
Newgate Calendar, Vol. I

The first known record of his song is about 1800:

          As I was going over Ruberry mountain,
          Gold and silver there was counting
          He thought it little I thought it better,
          I took the Gold from Colonel Pepper.
  
                  "Patrick Flemming" [also known as McCollister or The Irish
                  Robber or Whiskey in the Jar, etc - [thanx Bruce Olson]
  

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