Though handed down through generations of bards who carried on the tradition of singing that royal line's glories, it was seized by Balrahn and added to his collection, stating simply that bards, "don't need daggers to sing."
I always find it refreshing to see people get mythic/empy/relic weapons that aren't part of the band wagon or the most "useful" weapons. Good for you and playing the game you want to play it. Hope to see a SS of it at 90+!