Even before this season of Game of Thrones, fans had been clinging to a theory called R + L = J. Basically the theory was hatched about Jon Snow’s parentage saying that he was actually the son of Rhaegar Targaryen and Lyanna Stark. The theory began to pick up speed over the years, and GRRM even seemed to acknowledge it.
This past season of Game of Thrones (which went beyond the already published books) seemed to embrace it, although the finale left some people thinking Jon Snow’s father could’ve possibly been someone other than Rhaegar Targaryen. Now HBO released this infographic, which officially shows who Jon Snow’s parents are:
As you can see, it’s absolutely R + L = J. In a world of crazy internet fan theories that almost never end up being true, R + L = J is one very rare exception. So the fans who hatched R + L = J can pat themselves on the back, they got this one right.