The Grey Ghost was the smallfolk's name for the shyest of the three wild dragons of Dragonstone, a pale grey-white beast the color of morning mist who could hide himself in cloud and fog and avoided men and their works for years at a time. He lairs in a smoking vent high on the eastern face of the Dragonmont and fed on fish, and was most often glimpsed flying low over the narrow sea to snatch his prey from the water. No man ever claimed or rode him, and his age is not recorded, though he is thought to have been young.
When Prince Jacaerys Velaryon called the dragonseeds to Dragonstone in 129 AC some went looking for the Grey Ghost, Alyn of Hull among them, but none could find him. In 130 AC the crew of the Nessaria saw two dragons fighting above the Dragonmont and the Grey Ghost slain; the castellan Ser Robert Quince took it for the work of the Cannibal, but the killer was in truth the wounded Sunfyre, lately returned to the island in secret, who partly devoured him.