When George R R Martin wrote the Song of Ice and Fire, he started the first page with thousands of years of history behind it. And no matter how big Game of Thrones becomes, the past will always be a subject of curiosity. We have already seen that with Robert's rebellion and the love story of Rhaegar and Lyanna. We have seen how much this untold history impacts the current events of the show.
One such untold part of this mystical history is the ancient family of the Targaryens and the Doom of Valyria. And if you think why this is important, remember, all Valyrian steel blades were made in the ancient capital of Valyria, the dragons were first tamed in its fiery pits.
A small clip released by HBO goes through the beginning of the great conquest of Aegon Targaryen and his sisters.
It seems that the network is trying its fullest to fill the void for those who haven't yet read the books and in the form of an animated series, it also makes sure that we have something new to watch until season 8 comes to our doorsteps.