I heard Celestia did a great job of changing the history books, heck, she even removed her own sister and co-ruler from them, it's kind of irritating that we have that in common now. Not the whole sister thing but the rewriting the history books.

Where are my manners, my name is Kain, Lord of Theghria and I just woke up from a millenium long stasis with a few side-effects, in a bed surrounded by 3 strange mares and a changeling, all staring at me, good thing I know the changeling, otherwise this might be awkward.

Notes:
This starts just before Rainbow Dash gets her letter of acceptance to the Wonderbolt academy mid-season 3 and diverges from there.