New HBO spinoff reportedly to chronicle Aegon I Targaryen’s conquest — George R.R. Martin advising, Matt Tomlin set to write
2026-02-26
HBO reportedly developing Aegon I Targaryen spinoff
New HBO spinoff reportedly to chronicle Aegon I Targaryen’s conquest — George R.R. Martin advising, Matt Tomlin set to write

HBO may be preparing another spinoff set in George R.R. Martin’s world, according to insiders who follow the franchise closely. The report indicates the network is exploring a new entry in the expanding television universe that began with the original series and continued with subsequent projects.

The planned series will focus on the conquest of the continent by Aegon I Targaryen, depicting how he, with the aid of dragons and his sisters, came to seize the Iron Throne. The events portrayed in the show are said to take place roughly three centuries before the timeline of the original Game of Thrones series.

Sources say George R.R. Martin is providing advisory support to the creative team, while the screenplay is being handled by Matt Tomlin, who is attached as the writer. Beyond those creative credits, the report offers few additional production details.

Information about the cast has not been released, and there is no confirmed premiere date at this time. For now, the project remains in the early stages, with key specifics yet to be announced.

If produced, the new series would add to HBO’s continued expansion of material drawn from Martin’s works. Fans and observers will be watching for formal confirmations from the network and further casting and scheduling updates in the months ahead.