Hello ! I'am from Brittany and sing Aotroù ar c'hont (a ballad which looks like the scandinavian ones Elveskud, Riaddaros, etc.)
I think also that the heroe is innocent. Two countries only show him guilty : Germany (Staufenberg) and Scotland/England (Colven/Collins).

I am mading a collection of all european versions (and extra-european : for instance Quebec and french island of "La Réunion"). Please send me versions and all you think about it to kozh-noe at orange.fr

And excuse my poor english ! You may mail to me in breton language if you wish...

   Padrig

Kozh-Noe means : as old as Noe -- collecting songs from old ages