Did some checking based on that King John and The Abbot of Canterbury information, and found that it is a song that is in the DT. Child #45. It's also the tune/chorus of a number of other songs.

King John and the Abbot - Child 45
Red Iron Ore
On Midsummer Day
WHAT A COURT HATH OLD ENGLAND
Pickled Jew
COAL OWNER AND PITMAN'S WIFE
BLUE MOUNTAIN LAKE
THE DREADNAUGHT
AVINGTON POND
Barrel of Beer
Fiddle's Hard Case

Found other versions of the song at:

King John and the Bishop - Child #45 - Information
King John and the Abbot - Song
Quiller Couch - King John and The Abbot
King John and the Abbot of Canterbury- Fairy Tales
King John and the Abbot of Canterbury-
King John & the Bishop - Child #45
King John And The Abbot Of Canterbury
King John and the Bishop - Child #45