With House of the Dragon continuing to expand the lore of Westeros, fans are eagerly turning their attention toward the next epic Targaryen saga. Aegon’s Conquest, a prequel series in development at HBO, promises to dive deep into the fire-and-blood origins of the Iron Throne. Here’s everything we know so far about its release date, development status, and creative direction.
Aegon’s Conquest HBO Release Date Estimate
While Aegon’s Conquest has not yet received an official greenlight, current production trends and HBO’s scheduling strategy provide a release estimate of late 2027 or 2028.
As of mid-2025, script development is actively underway, with Mattson Tomlin — co-writer of The Batman — leading the writing efforts. However, with House of the Dragon Season 3 set for release in 2026, HBO is spacing out its Game of Thrones spin-offs to prevent oversaturation. This makes it unlikely for Aegon’s Conquest to enter production before 2026 or early 2027, pushing the premiere into the latter part of the decade.
What Is Aegon’s Conquest About?
Aegon’s Conquest will chronicle the legendary campaign of Aegon I Targaryen, the first king of a unified Westeros. Nearly 300 years before Game of Thrones, Aegon, alongside his sister-wives Visenya and Rhaenys, launched a dragon-backed invasion that transformed the continent and forged the infamous Iron Throne.
The series is expected to explore not only the battles and politics of this conquest but also the moral and philosophical consequences of empire-building — a theme that showrunner Mattson Tomlin says is deeply personal and inspired by real-world historical movements like the Romanian Revolution. According to SuperHeroHype’s detailed report, the writing process has involved close collaboration with George R.R. Martin, ensuring authenticity and emotional depth.
Creative Team & Development Status
Confirmed in early 2024, Aegon’s Conquest is currently in the scriptwriting and development stage. Mattson Tomlin has been working closely with George R.R. Martin, ensuring that the narrative remains faithful to the source material while offering fresh emotional depth and historical analogies.
While HBO has not yet given the show an official greenlight, the involvement of Tomlin and Martin, along with increasing fan demand for more Targaryen history, make Aegon’s Conquest one of the most anticipated future spin-offs in the Thrones universe.
Possible Characters & Casting Speculation
Although no casting announcements have been made, fans are already speculating about who might take on the mantle of Westeros’ first conqueror. Among the fan favorites:
- Henry Cavill is a popular choice to portray Aegon I Targaryen, due to his regal presence and fantasy genre experience.
- The roles of Visenya and Rhaenys Targaryen, Aegon’s sisters and fellow dragonriders, are also central and will be critical casting decisions.
- Aegon’s sons, Aenys and Maegor the Cruel, are likely to play major roles if the series extends beyond the conquest itself.
Given HBO’s track record with high-caliber casting and character development, expectations are high for a powerhouse ensemble.
Ties to House of the Dragon
The upcoming series will likely tie into themes introduced in House of the Dragon — particularly the Targaryen obsession with prophetic visions and dreams. In House of the Dragon, King Viserys I speaks of a dream foretelling the need for a united Westeros to face a future threat — a motivation hinted to have influenced Aegon’s conquest itself.
These narrative threads are expected to connect the Targaryen spin-offs into a unified historical saga, providing richer context for fans of both shows.
Final Thoughts
Though Aegon’s Conquest is still in development, its potential to bring one of Westeros’ most pivotal eras to life is undeniable. With Mattson Tomlin steering the writing and George R.R. Martin involved in the creative process, the series could become HBO’s next big fantasy hit.
A late 2027 or 2028 release may seem far off, but for fans of the Game of Thrones universe, the promise of dragons, conquest, and the birth of an empire is more than worth the wait.