Warning: Major spoilers ahead for House of the Dragon episode 1! Turn back now if you haven't watched the first episode yet!
House of the Dragon might be set 172 years before the birth of Daenerys Targaryen, but it still finds a way to link directly to the events of Game of Thrones. Towards the end of the first episode, King Viserys Targaryen tells his daughter – and soon-to-be heir – Rhaenyra about a prophecy passed from Targaryen to Targaryen, all about the end of humankind.
As Viserys explains, King Aegon Targaryen – that's Aegon the Conqueror, who won Westeros for the family decades prior – foresaw the end of man thanks to a winter coming from the North. He predicted that a Targaryen would need to be on the Iron Throne to unite the Seven Kingdoms against the apocalyptic threat. He called this the 'Song of Ice and Fire.' Cast your minds back to Game of Thrones season 8, and these events play out almost exactly – and we explain all right here.
A Song of Ice and Fire is the name of George R. R. Martin's series of novels, which the Game of Thrones TV show is based on. Throughout the original show, the White Walkers were a major threat to Westeros. Eventually, the danger of the Night King could no longer be underestimated, and Jon Snow set about trying to get help to face the undead. He enlisted Daenerys Targaryen and her armies, and, though they tried to convince Cersei Lannister to help, she betrayed them and did not send any aid for the fight. Ultimately, the combined armies of humanity triumphed over the Night King, who was killed by Arya Stark at the Battle of Winterfell.
Jon Snow, of course, turned out to be a Targaryen himself: another Aegon, son of Rhaegar Targaryen (that's Daenerys' brother) and Lyanna Stark
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