Game Of Thrones fans are certain the Night King is a Targaryen

Daily Mail - 04-18

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Game Of Thrones viewers have been convinced The Night King is a Targaryen because the fiery message resembled the house sigil and he rode an ice dragon. Fans pointed out the Night King's fire symbol at the end of season eight episode one had the hallmarks of a three-headed dragon which is the sigil of House Targaryen.