Legends and folklore is huge in Game of Thrones book series, one in particular is the legend of ‘Azor Ahai’, the warrior who drove the darkness away with his sword Lightbringer. How he forged the sword to bring the end in darkness was by plunging it into his wife’s heart. her soul and the hot blade created Lightbringer. A new ‘Azor Ahai’ was supposed to come again and many believe it to be either Daenerys Targaryen or Jon Snow.
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I think end the end it’s Jon Snow if the prophecies were interpreted this way- the ‘long night’ being Daenerys mad reign. A more detailed explanation can be found on distractify.com!
