Aegon's Conquest is being actively discussed at HBO as a potential Game of Thrones prequel (per Variety). This development brings into focus what is arguably the most important event in the recent history of Westeros. Also known as the War of Conquest/ the Targaryen Conquest, the campaign was initiated by the dragonlord, Aegon I Targaryen along with his sister-wives, Rhaenys and Visenya with three dragons by their side.