The Targaryen civil war known as the Dance of the Dragons will play out in House of the Dragon, HBO's first Game of Thrones spinoff, and that could end up connecting to The Winds of Winter. While Game of Thrones ended in 2019, there's still a lot more of Westeros' story to be told. That's true on the screen, with many other Game of Thrones spinoffs planned for after House of the Dragon, but also on the page too, with George R.R. Martin still writing The Winds of Winter, the sixth and penultimate book in the A Song of Ice and Fire series.
House of the Dragon begins around 200 years before Game of Thrones (and so The Winds of Winter as well), telling the story of House Targaryen being divided by claimants to the Iron Throne after the death of King Viserys I Targaryen (though the seeds are planted much earlier). That results in the Dance of the Dragons, a civil war that splits the realm in two, separating into supports of the «greens» and the «blacks,» the warring Targaryen factions behind either the claim of Aegon Targaryen or his half-sister Rhaenyra. The name of the civil war refers not only to the rivalry, but just how much of the war is fought with dragons.
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Rather than just being its own isolated story, this could also inform what is in The Winds of Winter and/or Martin's final A Song of Ice and Fire book, A Dream of Spring. The events of the Dance of the Dragons are already written, of course, but this could be a case where history repeats itself (a theme Martin is extremely fond of). With House of the Dragon showing The Dance of the Dragons, it's possible The Winds of Winter will actually include its sequel, a fiery clash between two
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