When Is 'House of the Dragon' Set? Timeline for 'Game of Thrones' Prequel

House of the Dragon returns viewers to the world of George R. R. Martin's Seven Kingdoms, charting the history of the Targaryen dynasty.

The HBO show, which premiered on August 21, follows the events that led to the Dance of the Dragons, the civil war that broke out between the family and almost threatened to annihilate the dragon-wielding house.

Given this is the show's focus the show's first season spans several years in a short period of time, which may lead some fans to wonder exactly when it is set.

Here is everything you need to know about House of the Dragon's timeline:

When is 'House of the Dragon' Set? Timeline for 'Game of Thrones' Prequel

House of the Dragon
Left, Milly Alcock as Princess Rhaenyra Targaryen as a teen, inset, Emma D'Arcy as Rhaenyra as an adult in "House of the Dragon." The new HBO show takes place almost 200 years before "Game of Thrones." Ollie Upton/HBO

House of the Dragon opens during King Jaehaerys I's reign, with the ruler choosing who to be his heir following the death of his son Aemon and Baelon. Rather than select his eldest son's daughter Rhaenys (Eve Best) he chose her cousin Viserys (Paddy Considine) to inherit the Iron Throne.

King Jaehaerys I had a peaceful rule, which was also one of the longest in Westeros, lasting from 48 AC to 103 AC in George R. R. Martin's books.

In the world Martin created, "AC" represents the years after Aegon Targaryen's Conquest of Westeros, with the years dated AC to mean after the conquest and BC to mean before the conquest in the historical texts of the franchise.

The show later focuses on King Viserys I's reign over the Seven Kingdoms, which took place from 103 AC to 129 AC.

For context on how this compares with the time period of HBO's flagship series Game of Thrones, the original show's first ruler Robert Baratheon was King of the Seven Kingdoms from 283 AC to 298 AC.

The original show's first season is set predominantly at the end of Robert Baratheon's reign, so this means that the prequel takes place almost 200 years before it.

So far, House of the Dragon is focused on the early years of King Viserys I's rule when his daughter Princess Rhaenyra was still a teen. She was born in 97 AC and in Martin's novels she is named King Viserys I's heir in 105 AC.

House of the Dragon's first episode sees this succession come to pass, so the episode takes place around 105 AC though Rhaenyra appears older than eight-years-old in the show so it may be that it is set a few years later.

The show features Milly Alcock in the role of Rhaenyra in her younger years and the part will later be taken over by Emma D'Arcy, meaning the season will chart at least a decade, if not more, during the character's life.

The Dance of the Dragons, which the show will also focus on, begins following the death of King Viserys I in 129 AC, the civil war lasted from the year of his passing until mid-131 AC.

House of the Dragon airs Sundays at 9 p.m. ET/PT on HBO and HBO Max.