I was under the assumption that we were brought into Hydaelyn from an unknown world and were not a part of this world at all so what I did was continued the story of my Elder Scrolls character I created back in Morrowind, since he was infected with Corpus but had the negative side effects removed he is effectively immortal (if anyone has played that game you'll know what I'm talking about). So basically he was summoned from Tamriel by Hydaelyn to Eorzea and this is just a continuation of that character's story.