"'Bruton Town' is unquestionably based on 'Isabella and the Pot of Basil'."
Or 'A Pot of Basil' is based on an earlier song
I seem to remember that there was a renaissance fablieu from around the same time as Boccaccio which indicates that is was in common currency even earlier
Keach in the Creel has a similar history, this time involving the apprentice of a renaissance painter
These things always come with the chicken/egg enigma
Jim Carroll