There is a theory which says that Tyrion was a Targaryen. Tywin was Hand of King of Aerys II Targaryen, otherwise known as The Mad King. There are a couple of confirmed points regarding Aerys’ relationship with Tywin’s wife, Joanna. Barristan Selmy tells Daenerys that the King was said to be infatuated with her. Tywin says Tyrion isn't his son, multiple times.

The fact that Tyrion was able to talk down both dragons, Rhaegal and Viserion, from turning him into a pile of ash, could be the very proof that we've been looking for that this Lannister actually has Targaryen blood running through his veins. The way he spoke to the dragons was so calming, almost like a lullaby or as if he were telling them a bedtime story. He told the dragons that he asked for one of them as a pet on the day of his name day and cried himself to sleep when he was told that they no longer existed.

Creators: David Benioff, D.B. Weiss

Stars: Emilia Clarke, Peter Dinklage, Kit Harington, Sophie Turner

Original network: HBO

Distributor: Warner Bros. Television Distribution

Peter Dinklage - An American film, television and stage actor. He received international recognition for portraying Tyrion Lannister on the HBO television series Game of Thrones, for which he won the Emmy Award for Outstanding Supporting Actor in a Drama Series a record of four times.