The site asked Harington about the one of the most legit theories about the show: that Snow is the Prince That Was Promised . The theory says that someone of royal blood will save everyone from an evil darkness (a.k.a. the White Walkers) and that he or she would be (among other things) born under a "bleeding star." In one of Bran Stark's visions in season 6, we see the birth of a child (Snow) in the Tower of Joy. Leaning at the foot of the bed is a special sword (made from the heart of a fallen star) and it's covered in blood — get it? These details cemented the theory that had been floating around for a while that Snow would be the key to defeating the White Walkers. The prophecy comes from Melisandre, and although she has been wrong before, fans really think that either Snow or Daenerys Targaryen could and would fulfill this destiny by the end of the season.