Written by George R.R. Martin in collaboration with Elio Garcia and Linda Antonsson

In the end they prevailed, and Princess Alyssa ascended into the sky upon Meleys, a splendid scarlet she-dragon, never before ridden. “Red maidens, the two of us,” the princess boasted, laughing, “but now we’ve both been mounted.” The princess was seldom long away from the Dragonpit after that day. Flying was the second sweetest thing in the world, she would oft say, and the very sweetest thing could not be mentioned in the company of ladies. The Dragonkeepers had not been wrong; Meleys was as swift a dragon as Westeros had ever seen, easily outpacing Caraxes and Vhagar when she and her brothers flew together.

- Fire and Blood "The Long Reign - Jaehaerys and Alysanne: Policy, Progeny, and Pain"

Against all advice, his mother clapped the boy in swaddling clothes, strapped him to her chest, and took him aloft on Meleys when he was nine days old. Afterward she claimed Viserys giggled the whole while.

- Fire and Blood "The Long Reign - Jaehaerys and Alysanne: Policy, Progeny, and Pain"

And that was just what he did, for later that same year Princess Alyssa bore her Spring Prince a second son, who was given the name Daemon. His mother, irrepressible as ever, took the babe into the sky on Meleys within a fortnight of his birth, just as she had done with his brother, Viserys.

- Fire and Blood "The Long Reign - Jaehaerys and Alysanne: Policy, Progeny, and Pain"

Rhaenys, at six-and-ten, was a fearless young beauty, and more than a match for her mariner. A dragonrider since the age of thirteen, she insisted upon arriving for the wedding on Meleys, the Red Queen, the magnificent scarlet she-dragon that had once borne her aunt Alyssa. “We can go back to the ends of the earth together,” she promised Ser Corlys. “But I’ll get there first, as I’ll be flying.”

- Fire and Blood "The Long Reign - Jaehaerys and Alysanne: Policy, Progeny, and Pain"

At Highgarden, he was joined for a time by his granddaughter, Princess Rhaenys, who flew to his side on Meleys, the Red Queen. Together they visited the Shield Islands, where the king had never been before.

- Fire and Blood "The Long Reign - Jaehaerys and Alysanne: Policy, Progeny, and Pain"

Prince Aemon followed a few hours later, after bidding farewell to Lady Jocelyn and their daughter, Rhaenys. The princess had just learned she was expecting, else she would have accompanied her sire on Meleys. “Into battle?” the prince said. “As if I would ever have permitted that. You have your own battle to fight. Lord Corlys will want a son, I am sure, and I would like a grandson.”

- Fire and Blood "The Long Reign - Jaehaerys and Alysanne: Policy, Progeny, and Pain"

Rhaenys’s own she-dragon, Meleys the Red Queen, had grown lazy, but remained fearsome when roused.

- Fire and Blood "The Dying of the Dragons: The Blacks and the Greens"

Here Mushroom’s version seems most likely, for we know that nine days after Lord Staunton dispatched his plea for help, the sound of leathern wings was heard across the sea, and the dragon Meleys appeared above Rook’s Rest. The Red Queen, she was called, for the scarlet scales that covered her. The membranes of her wings were pink, her crest, horns, and claws bright as copper. And on her back, in steel and copper armor that flashed in the sun, rode Rhaenys Targaryen, the Queen Who Never Was.

- Fire and Blood "The Dying of the Dragons: The Red Dragon and the Gold"

Meleys suffered a score of hits, but the arrows only served to make her angry. She swept down, spitting fire to right and left. Knights burned in their saddles as the hair and hide and harness of their horses went up in flames. Men-at-arms dropped their spears and scattered. Some tried to hide behind their shields, but neither oak nor iron could withstand dragon’s breath. Ser Criston sat on his white horse shouting, “Aim for the rider,” through the smoke and flame. Meleys roared, smoke swirling from her nostrils,  a stallion kicking in her jaws as tongues of fire engulfed him.

- Fire and Blood "The Dying of the Dragons: The Red Dragon and the Gold"

With a glad cry and a crack of her whip, she turned Meleys toward the foe. Against Vhagar alone she might have had some chance, but against Vhagar and Sunfyre together, doom was certain. The dragons met violently a thousand feet above the field of battle, as balls of fire burst and blossomed, so bright that men swore later that the sky was full of suns. The crimson jaws of Meleys closed round Sunfyre’s golden neck for a moment, till Vhagar fell upon them from above. All three beasts went spinning toward the ground. They struck the ground so hard that stones fell from the battlements of Rook’s Rest half a league away.

Those closest to the dragons did not live to tell the tale. Those farther off could not see for the flame and smoke. It was hours before the fires guttered out. But from those ashes, only Vhagar rose unharmed. Meleys was dead, broken by the fall and ripped to pieces upon the ground.

- Fire and Blood "The Dying of the Dragons: The Red Dragon and the Gold"