Reported to be an upcoming Game of Thrones prequel, Aegon's Conquest is arguably the most pivotal event in Targaryen history. The dragonlord of Valyrian descent, Aegon I spearheaded the conquest of the Seven Kingdoms, but he wasn't alone in his expansionism. He was aided by his sister-wives, Visenya and Rhaenys, three large dragons, and a small army.