*spoilers for the Fire & Blood book, and possible spoilers for House of the Dragon*
Placed in the crib of Aegon III, the son of Rhaenyra Targaryen and Daemon Targaryen. The hatchling was of barely riding age during the Dance of the Dragons. Aegon was his one and only rider.
Not specificed in colour, though it can be assumed that his colouring was the hue of a storm cloud — dark gray.
Stormcloud’s history was short, although the dragon made a profound impact on many lives. During the war, Jacaerys, Aegon’s eldest brother, sent him and his brother, Viserys, off to Pentos to be fostered by the Prince of Pentos for their safety.
The young Princes boarded the ship, Aegon with Stormcloud and Viserys with his own egg. However, it was attacked by warships sailing under the banners of the Three Daughters. Aegon escaped by flying away on Stormcloud, his first flight.
Amazingly, Stormcloud flew back to Dragonstone, with the young Princeling clutching onto his back. He made the journey but was mortally wounded and died within the hour. The young dragon had taken multiple arrows to the belly and a scorpion bolt through his neck.
After the death of his mount, Aegon never flew again.
gif credit: @hvitserkk, @drogonthered.