Rhaegar Targaryen has a lot of Game of Thrones fans talking, even though his presence on the show has mostly consisted of anecdotes and differing accounts of what happened between him and Lyanna Stark. Mounting evidence suggests that Rhaegar will make his onscreen debut soon, which means it's time to ask and answer, "Who is Rhaegar Targaryen?"
What was Jon Snow's father like? What were his personality traits? Why did Robert Baratheon hate him so much? Just what were the circumstances of Rhaegar's alleged abduction of Lyanna Stark? And is any of this related to the prophecy of the Prince That Was Promised? Could the story of Rhaegar Targaryen shed some light on how this series will end? He is, without a doubt, one of the most important figures in A Song of Ice and Fire, and it's entirely possible he's the key to victory over the White Walkers.