All is never what it seems! O'Carolan undoubtedly wrote the tune for Miss McDermott Roe (later Mrs Mary O'Rourke) However the claim that the McDermott Roe family were descendants of the Coolavin royal family is disputed, not least by Donal O'Sullivan (1958) 'The Life & Times of an Irish Harper') who thinks that was another branch of the McDermott family entirely! (O'Carolan also wrote tunes for them!)