In 1 AC, at the official start of the Targaryen dynasty, only three dragons survived the Doom of Valyria. These formidable beasts, which enabled Aegon the Conqueror to unite Westeros, were: [1, 2, 3, 4] Balerion the Black Dread: A massive, black-scaled dragon, ridden by Aegon I Targaryen. He was the oldest and largest dragon alive, having been born in Valyria prior to 114 BC. [1, 2, 3] Vhagar: A massive, bronze-scaled she-dragon ridden by Visenya Targaryen. Hatched on Dragonstone in 52 BC, she was the second-largest dragon at the time. [1, 2, 3] Meraxes: A large, silver-scaled she-dragon with golden eyes, ridden by Rhaenys Targaryen. Hatched prior to 88 BC, she was graceful and incredibly fast. [1, 2, 3, 4] #gameofthrones #houseofthedragon #hbomax #hbo #hotd