"Any suggestion that the melody 'dates back to medieval times' was probably made by a romantic fantasist who also imagined that the pyramids were built by Martians. Of course, I'd be glad to hear of any verifiable evidence that might support either of those assertions; Ossian's Folksongs and Ballads Popular in Ireland books, however, are about as reliable as a dandelion clock when it comes to telling the time."

Thanks for a good laugh Malcolm!!!