How does House of the Dragon differ from Fire & Blood?

Why does the series have to choose between versions?

Because its source refuses to. Fire & Blood presents itself as a history compiled by Archmaester Gyldayn, a scholar inside the world, who draws on earlier accounts that often contradict each other and who says so. A reader is invited to weigh one chronicler's account against another's and decide which to believe. That is a pleasure on the page and impossible on screen, where a camera has to show one thing happening.

So every major scene in the series is an act of selection. Where the history offers two accounts of a death, the show stages one, or blends them, or invents a third that explains why the chroniclers disagreed. This is the most important difference between the two, and it is why arguments about faithfulness to the book are often arguments about which unreliable narrator the show trusted.

Which changes did the series make on purpose?

The clearest is the killing remembered as Blood and Cheese. In the first episode of its second season, the series sends the two killers in revenge for the death of Rhaenyra's son Lucerys, has Daemon name Aemond as their target, and has Mysaria hire them on his behalf. The book does not give Daemon that instruction and leaves unclear whom they were meant to kill. The change makes Daemon's guilt sharper and his motive easier to follow.

The second change concerns Helaena's children. In Fire & Blood she has three, the twins Jaehaerys and Jaehaera and a younger son, Maelor; the series has only the twins. Cutting a child simplifies one of the cruellest scenes in the history, which in the book turns on a mother forced to choose between her sons. Both changes point the same way: the series trims ambiguity and cast size in favour of motives a viewer can track.

What does the series add to tie itself to Game of Thrones?

Its first episode introduces a dream passed down from Aegon the Conqueror, a warning of a threat from the North that only a united realm could face, and frames the Targaryen succession as a matter of keeping that warning alive. The effect is to give a story about a family quarrel a stake that viewers of Game of Thrones already know the end of, so that every Targaryen who squanders the realm's strength in the Dance is also failing a test set centuries earlier.

That framing is the series' own interpretive choice, and it changes how the war reads. Without it, the Dance is a cautionary tale about inheritance and pride. With it, it becomes the first link in a chain that ends with the war against the dead. Whether that strengthens the story or flattens it into a prequel is one of the main points on which viewers of the two series disagree.

Who made the series, and how did it change behind the camera?

Wikidata credits House of the Dragon to Ryan Condal and George R. R. Martin as its creators. For the first season Condal shared the running of the show with Miguel Sapochnik, who also directed its first episode; Sapochnik stepped away after that season, leaving Condal in charge. The first episode aired on 21 August 2022, the same date Wikidata gives as the series' start.

By the date this page was last checked, three seasons had aired, totalling twenty-six episodes. The series adapts only the later part of Fire & Blood, the reign of Viserys I and the war that follows it, so its pacing is very different from the book's. A single chapter of the history can become an episode, and a few lines of it a whole scene, which is another reason the two diverge in emphasis even where they agree on events.