Rhaegerys Targaryen, sometime called Brightsteel, is a distant relation of House Targaryen. He is descended from Aelyx Targaryen, Aegon the Conquerors' great uncle.
Rhaegerys was born ten years before Viserys Targaryen, in Volantis. He was known to have battled slavers off of the coast of Volantis, where it is said his Valyrian Steel Sword glittered so bright, the slavers crashed their ship into rocks. His parents were Domerys and Rella.