Rhaegal is the green dragon of Daenerys Targaryen, hatched with Drogon and Viserion upon Khal Drogo's pyre in the Dothraki sea in 299 AC and named for her brother, Prince Rhaegar Targaryen. His scales and wings are jade green and his eyes bronze, his teeth black needles, and his flame burns orange and yellow shot through with veins of green. No rider has ever mounted him.
When a shepherd laid the bones of his daughter before the queen in Meereen, Daenerys had Rhaegal and Viserion chained in a makeshift pit beneath the Great Pyramid; it took three days to drag the green dragon from the terrace, and six men were burned in the doing. His confinement made him savage. In 300 AC, after the queen had vanished on Drogon's back, Prince Quentyn Martell came into the pit to claim a dragon with a whip and had eyes only for Viserion; Rhaegal was behind him, and burned him so badly that he died days later. Loosed upon the city, Rhaegal made his lair first upon the pyramid of Hazkar, which collapsed beneath him, and then upon the pyramid of Yherizan, and Ser Barristan Selmy judged him the more dangerous of the two brothers left in Meereen.