User blog comment:Timeoin/Is Dawnguard the first DLC/@comment-4011214-20120323152039/@comment-3076045-20120323152406

Well, they do appear in Pieces of the Past :)

That said - it could also be something to do with Dawnstar. Personally, I'd like to see it have something to do with the ruins of Dawnstar. (the destruction of which caused the creation of the Guilds Act - and led to the Fighters and Mages Guilds. That's just me though :)