House of the Dragon Season 3: Every Major Change From the Book in the Battle of the Gullet

Spoiler Alert !!!
Major spoilers ahead for House of the Dragon Season 3 Episode 1

House of the Dragon roared back onto HBO for a third season on Sunday, June 21, 2026. The season 3 premiere hands roughly 25 minutes of screen time to one of the major events from George R.R. Martin’s book, Fire & Blood, the Battle of the Gullet. In the book, the battle barely fills four pages, but Ryan Condal’s show makes it one of the most punishing sequences in the battle between the Blacks and the Greens.

House of the Dragon Season 3Details
ShowrunnerRyan Condal
Based onFire & Blood by George R.R. Martin
CastMatt Smith, Emma D’Arcy, Olivia Cooke, James Norton, Steve Toussaint, Fabien Frankel, Matthew Needham, Sonoya Mizuno, Tom Glynn-Carney, Ewan Mitchell, and Harry Collett
Premiere DateJune 21, 2026

The battle scenes include a massive naval assault that leaves thousands dead, takes down a major character and their dragon, and claims a key supporting player. To squeeze the entire civil war’s sprawling timeline into a series ending with Season 4, the show adds riders who were never at the Gullet, removes figures who shaped the book’s version, and reshuffles who lives and who dies. Here are all the major changes made to this battle in the show.

1. The Book and the Show Differ on Who Did and Didn’t Fight in the Battle

Jacaerys Velaryon and Queen Rhaenyra in House of the Dragon
Jacaerys Velaryon and Queen Rhaenyra in House of the Dragon | Credits: HBO

In Fire & Blood, Team Black brings a full complement of dragonriders to the Gullet. Jacaerys, aka Jace, rides Vermax, accompanied by Ulf White on Silverwing, Nettles on Sheepstealer, Addam of Hull on Seasmoke, and Hugh Hammer on Vermithor. Baela Targaryen, Jace’s betrothed, and her dragon Moonrider are absent from the battle as the dragon was too small to be thrown into a fight on that scale.

However, the show reshuffles that roster considerably. Here, only Jace and Baela actually fly to war. The three dragonseeds, Hugh, Ulf, and Addam, are held back to ambush Aemond, whom Rhaenyra believes is bound for Harrenhal. Interestingly, Rhaena turns up on Sheepstealer, replacing the character of Nettles from the book. Her dragon eventually causes huge casualties to the Blacks when it turns on their own Velaryon ships, as well as the other dragons in the sky.

2. They Differ on What Happened to Aegon and Viserys

Queen Rhaenyra with Aegon the Younger and Viserys in House of the Dragon
Queen Rhaenyra with Aegon the Younger and Viserys in House of the Dragon | Credits: HBO

In Fire & Blood, Aegon III and Viserys II are aboard a ship called the Gay Abandon, being sent to Pentos for fostering. They get caught up in the battle, and as the chaos erupts, Aegon flees on Stormcloud and reaches Dragonstone alive, though his dragon is mortally wounded in the escape.

Viserys hides his dragon egg and disguises himself as a ship’s boy, but he’s captured and handed over to Lohar. He is believed to have been dead for years before Alyn Velaryon brings him home. That lost boy grows up to become King Viserys II, the ‘Broken King,’ whose line eventually runs down to the Mad King and Daenerys.

However, none of this happens in the show. House of the Dragon’s Aegon and Viserys are toddlers in the show, and they were already packed off to Pentos back in the Season 2 finale. They are nowhere near the Gullet during this battle. The lost prince storyline now looks unlikely in the show.

Stormcloud is still a flightless hatchling in the show. He, along with Joffrey Velaryon’s dragon Tyraxes and four dragon eggs, is shipped off to Lady Jeyne Arryn.

3. Rhaena’s Role in the Battle and Her Bond With Sheepstealer

Phoebe Campbell as Rhaena in House of the Dragon
Phoebe Campbell as Rhaena in House of the Dragon | Credits: HBO

In the book, the rider bonded to the wild dragon Sheepstealer is a mysterious lowborn dragonseed named Nettles, aka Netty. House of the Dragon cuts Nettles entirely and hands her role to Daemon’s daughter, Rhaena Targaryen. The setup began in the Season 2 finale, when Rhaena, who was tasked with escorting the young princes to Pentos, instead went after a dragon spotted in the Vale.

The premiere pays it off with her finally bonding with Sheepstealer (In the book, her dragon is a hatchling named Morning). Nettles and Sheepstealer did fight at the Gullet in the book. However, when Rhaena fights with Sheepstealer, the show flips the entire circumstance surrounding Jace’s eventual death.

In the show, Rhaena can fly Sheepstealer, but can’t control him. The moment she orders him to attack, he turns on friend and foe alike, torching the Blacks’ own ships and chasing down Jace and Vermax. It almost reminds us of Aemond losing command of Vhagar when it killed Lucerys and Arrax in Season 1.

4. Sharako Lohar’s Revenge Against Corlys Velaryon & Her Eventual Death

Abigail Thorn as Sharako Lohar in House of the Dragon
Abigail Thorn as Sharako Lohar in House of the Dragon | Credits: HBO

The show reshapes both the why and the how of Sharako Lohar’s arc. In Fire & Blood, Lord Corlys Velaryon, the Sea Snake, never actually fights in the battle, and afterward, surveying the wreckage of a third of his fleet, he reflects that if this is what victory costs, he hopes never to win again.

The series puts Corlys right in the middle of it, sailing into battle aboard a ship named The Queen Who Never Was, alongside his bastard son Alyn of Hull. Dropping Corlys into the fight gives the show’s Lohar a personal motive. She was out for revenge on the Sea Snake for years of campaigning against the Triarchy in the Stepstones.

Lohar’s Triarchy forces strike Driftmark and set Corlys’s castle of High Tide ablaze. The admiral’s obsession with the Sea Snake turns into a relentless chase that ends in hand-to-hand combat. In the fight, Corlys goes overboard, leaving Lohar facing Alyn, who kills the admiral with a quick stab to the throat. That’s a major departure from the book.

In the book, Lohar survives the Gullet entirely and only dies later. The book’s version of the battle and its heavy losses also sparked a follow-up conflict called the Daughter’s War, which now seems unlikely to ever reach the screen.

5. The Sequence Before Jacaerys’s Death Was the Show’s Contribution

Harry Collett as Jacaerys Velaryon in House of the Dragon
Harry Collett as Jacaerys Velaryon in House of the Dragon | Credits: HBO

Jace’s actual death stays fairly faithful to the book. What the show invents is the sequence leading up to it. In Fire & Blood, there’s no scene of Jace forcing his way into the battle. However, in the show, when word of the attack reaches Dragonstone and Rhaenyra prepares to ride out herself, Jace has his mother locked inside her chambers so that he can take her place in the fight. He then flies off with Baela and Moondancer at his side.

This foolish act from Jace was a major departure, as he actively took part in the battle planning with the Queen in the book. Bringing Baela along means Jace’s betrothed witnesses his death firsthand, and it also makes her complicit in the decision to confine Rhaenyra. Neither of these events is likely to sit well with the grieving queen once the dust settles. From there, the end comes much as it does on the page, and it’s brutal.

Vermax is brought down by enemy fire and dragged beneath the water, and a floating Jace is cut down by arrows loosed from a nearby boat. The episode wrapped with a tragic death that will have devastating consequences in the coming episodes.

What do you think of these changes from the book in the show? Let us know in the comments below!

House of the Dragon Season 3 Episode 1 is now available for streaming on HBO Max.

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