Full spoilers for Game of Thrones: Season 7 episode "Eastwatch" continue below. This post also includes key speculation and book spoilers about the parentage of Jon Snow. Read on at your own risk. If only Samwell Tarly could not have cut Gilly off right then. Thank goodness he and Shireen taught her to read, though, because she just half-revealed one of the most game-changing, mic drop bits of information Game of Thrones has ever seen. For context, Gilly was reading from Maester Maynard's book in Oldtown when she comes across a line that reads: "Maynard says here that he issued an annulment for Prince Rhaegar and re-married him to someone else at the same time in a secret ceremony in Dorne." Continue reading…