The Batman 2 writer teases two notebooks full of material for his Game of Thrones spin-off Aegon's Conquest

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The Batman 2 writer teases two notebooks full of material for his Game of Thrones spin-off Aegon's Conquest News By Emily Garbutt published 2 February 2026

Work is well underway on the script for Aegon's Conquest

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The Batman 2 screenwriter Mattson Tomlin is working hard on his Game of Thrones spin-off.

"Always satisfying to finish filling a notebook," he wrote on Twitter, alongside a photo of two notebooks. One is labelled "Conquest/Caine 24/25", while the other is marked "Conquest/Possessor/16 Bars/The Crew."

"Conquest" refers to Aegon's Conquest, which has been in development for around two years now. Originally assumed to be another TV show, last month it was reported that the project "is being developed by HBO as a possible drama series and by the Warner Bros. film team as a mammoth Dune-sized feature film."

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• The Aegon's Conquest Game of Thrones spin-off is being developed as a HBO TV show and as a "Dune-sized feature film"
• Upcoming Game of Thrones movies and TV spin-offs in 2026 and beyond
• "Most" of the Game of Thrones spin-offs in the works are prequels, but creator George R.R. Martin confirms "some" sequels are still in development

Set 100 years before House of the Dragon and 200 years before Game of Thrones, the project will follow King Aegon I Targaryen as he conquered and united six of the seven kingdoms of Westeros (Dorne retained its independence for a while longer) and commenced centuries of Targaryen rule on the Iron Throne. He foresaw "the end of the world of men", caused by a long winter from the North (sound familiar?), which could only be defeated if a Targaryen ruled over Westeros – a prophecy that he called the 'Song of Ice and Fire'.

House of the Dragon season 3 is on the way later this year to continue the story of the Targaryen civil war that takes place a century after the Conquest, but, in the meantime, there's another Game of Thrones spin-off on our screens: A Knight of the Seven Kingdoms.

This show follows hedge knight Dunk and his young squire Egg as they seek fame and fortune at a tourney – but not without running into some trouble first. This is Westeros, after all.

A Knight of the Seven Kingdoms airs weekly on HBO/HBO Max and Sky Atlantic/NOW. Make sure you never miss an episode with our A Knight of the Seven Kingdoms release schedule, or check out our verdict in our A Knight of the Seven Kingdoms review.

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Contact me with news and offers from other Future brandsReceive email from us on behalf of our trusted partners or sponsorsBy submitting your information you agree to the Terms & Conditions and Privacy Policy and are aged 16 or over. Emily GarbuttSocial Links NavigationEntertainment Writer

I’m an Entertainment Writer here at GamesRadar+, covering everything film and TV-related across the Total Film and SFX sections. I help bring you all the latest news and also the occasional feature too. I’ve previously written for publications like HuffPost and i-D after getting my NCTJ Diploma in Multimedia Journalism. 

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Logout Read more The Aegon's Conquest Game of Thrones spin-off is being developed as a HBO TV show and as a "Dune-sized feature film"    Upcoming Game of Thrones movies and TV spin-offs in 2026 and beyond    "Most" of the Game of Thrones spin-offs in the works are prequels, but creator George R.R. Martin confirms "some" sequels are still in development    Knight of the Seven Kingdoms showrunner says he "did this [season] for George [R.R. Martin]," and the Game of Thrones creator has "only been a benefit to this show"    The future of Westeros looks bright as House of the Dragon season 4 and A Knight of the Seven Kingdoms season 2 get confirmed by HBO    George R.R. Martin has shared outlines for up to 12 novellas to inspire future seasons of A Knight of the Seven Kingdoms    Latest in Fantasy Shows A Knight of the Seven Kingdoms showrunner says he made "peace" with the huge episode 3 twist being an open secret    Skyrim lead says Game of Thrones author should say HBO "finished my work and now I want to do something new"    God of War show goes full Ragnarok as it casts Odin and Thor    That ominous A Knight of the Seven Kingdoms episode 3 prophecy actually ties into the George R.R. Martin book lore    Apple may have the next Game of Thrones on its hands with an adaptation of Brandon Sanderson's Cosmere universe    Game of Thrones fans have spotted a small A Knight of the Seven Kingdoms detail that hints Egg is hiding something    Latest in News HBO boss says It: Welcome to Derry season 2 is "not in limbo at all" and he would be "happy to do it"    Jujutsu Kaisen manga casually reveals a fan-favorite character lives in the sequel after all    Nintendo does what '90s Nintendo could only dream of – sell out of the Virtual Boy    The Batman 2 writer teases two notebooks full of material for his Game of Thrones spin-off Aegon's Conquest    Avengers: Doomsday directors may have revealed too much after deleting a video showcasing the biggest fan theories    MMO Ashes of Creation hit with "mass" layoffs after studio founder resigns "in protest"    GAME REVIEWSMOVIE REVIEWSTV REVIEWS

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