Namely, who are Jon Snow's parents?
The lead theory - known in super-fan parlance as "R+L=J" - is that Snow is the offspring of Rhaegar Targaryen and Lyanna Stark.
One thing's for sure: All season GOT showrunners have been laying the groundwork around Bran's storyline to reveal the big secret about Jon's real parents.
After last week’s epic Battle Of The Bastards episode, Snow announced his plans to lay Rickon to rest in the Winterfell crypt beside his father, which means that Jon will be visiting the graves below his family's house.
As always there’s a Reddit theory explaining how this has been the plan along. In a very long, and detailed explanation that provides 18 sepaate citations Reddit user jamieandclaire theorises that Jon will learn the truth when exploring the Stark family crypt after retaking Winterfell.
The final episode of Game of Thrones is airing today in the States, so we won't be in suspense for long!