User blog comment:Hyperborean/"The House of Hades" – official expectations blog/@comment-4649443-20130417033058/@comment-4649443-20130511033116

It does have a history. It was owned by a girl destined to die, but was saved by Halcyon Green, and was passed on the him, then Hal gave it to Luke(saying it protects whoever holds it, which also means it wasn't Hal's fault he saved the girl with his prophecy, it was the dagger's fault), who gave it to Annabeth, who gave it to Percy, who gave it to Luke, who stabbed his armpit with it. Then it was picked up by Annabeth again.