Hey guys :D
I just wanted to tell you that I am sorry for the probably not exact translate. I'm french, the fiction is french, so I am not the best to translate it.
The original fic was written by Bro-Nie : http://mlpfictions.com/story/339/brasier-annee-zero
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Thousands years before the advent of Twilight Sparkle and her friends, whenEquestria was still a young nation, ponies, pegasi and unicorns are trying to evolve in concert, even if the unification of the three tribes is not so old. In the midst of all this, Celestia Alicorne teenager is trying to find her place in a world that displeases him. Easier to say than to do when the History pushes her to the spotlights, and becomes princess of the unicorns. In the dark, or in bright light, forces are plotting against the throne, threatening to plunge the country into chaos at any time. But maybe that the new Celestia's friend, the mysterious Discord, will help to support this?

This is the story of the origins of the Princess of Equestria, and most famous draconequus to have ever walked the equestrien ground.

Here's the story from the beginning.

Here's Brasier Année Zéro.