WARNING: The following article contains spoilers for the second episode of the eighth season of Game of Thrones, "Knight of the Seven Kingdoms."
Set in the final hours before the Night King and his army arrive at Winterfell, the newest episode of Game of Thrones gave most of the cast assembled to fight him some final moments of anxious peace. But amidst the character beats and flashes of closure, the episode also includes an incredibly sly reference to the original A Song of Ice and Fire books, as well as a major prophecy within the series.
The song that Podrick sings in the episode, "Jenny's Song," has a deeper meaning in the books. While it's never appeared in full, the song could actually have a subtle connection with the prophecy of Azor Ahai, the legend of the Prince Who Was Promised, which has been referenced frequently in the series. The choice to feature "Jenny's Song" here may be a clue that the prophecy will come back to play a role in the climax of the fantasy series.
The Prince That Was Promised
The prophecy about Azor Ahai has been frequently referenced on the show, primarily through the Red Priestess, Melisandre. She was first appeared in Season 2, introducing the idea that Stannis Baratheon was the prophesied hero.
The song references the legend of Azor Ahai, an ancient warrior prince who led the First Men during the last Long Night and helped defeat the White Walkers alongside the Children of the Forest. The hero forged a magical flaming sword called Lightbringer, but he was forced to sacrifice his beloved wife to receive that power. The prophecy suggests the same fate will befall the second coming of Azor Ahai, who will return as The Prince That Was Promised, reborn as a new hero.
The prophecy has a real power within Game of Thrones, being modified and reexamined over the series to reflect other potential heirs to the title. Jon Snow and Daenerys Targaryen have both been floated as possible new incarnations of the hero now that Stannis is gone. The return of the White Walkers would prompt such a reincarnation of the hero, and it has been the mission of the Red Priestess to find this person.
Ghost Of High Heart
Prophecy ends up being a much more common occurrence in the books. In A Storm of Swords (the third entry in the A Song of Ice and Fire series), Arya and the Brotherhood Without Banners come to a mysterious woman known as the ghost of High Heart to hear her tell stories of the future.
She predicts events like the Red Wedding (where many of the Starks are betrayed and murdered), the Purple Wedding (where Joffrey is poisoned) and the death of Balon Greyjoy (at the hands of his brother Euron). When she sees Arya, she even makes a strange and haunting prediction about what will become of the young Stark.