Rhaenys Targaryen was Aegon I's younger sister-wife, third of the Conquest's dragonriders astride Meraxes, and by most surviving accounts the most sociable of the three — fond of singers, fond of travel between the new kingdom's courts, and reportedly the family member the lords of the Reach and the Vale found easiest to actually enjoy hosting. The epithet later chroniclers gave her, "the Queen Who Never Was," marks a real gap in the record: for all she did to win the Seven Kingdoms, only Aegon sat the Iron Throne, and only his son by Rhaenys — not Rhaenys herself — inherited it.
She died attempting to finish what her husband's Conquest had left undone. In 10 AC she flew Meraxes to Hellholt during the fighting the Citadel groups under the First Dornish War, and a scorpion bolt loosed from the castle's walls caught the dragon through the eye. Dragon and rider fell together, and the war that killed her taught the Targaryens a lesson about Dorne that took them the better part of two centuries to fully absorb: dragons make conquest look easy right up until they don't.