As far as we are aware there are 3 known about Dragons in the world discounting the theories of a dragon under Winterfell, Asshai (can't wait till we get a POV here) supposedly being where dragons are born, stone dragons in Danys vision or ice dragons which are larger then usual and can destroy a normal dragon with ease.
Rhaenyra (Milly Alcock, later Emma D’Arcy) was one of the youngest dragon riders in Targaryen history at just seven years old. She rides a yellow dragon named Syrax, named after a goddess of
Update: I made a mistake. Seasmoke is not a wild dragon but is ridden by Laenor Velaryon. ——— I made this size comparison of all the dragons I believe we will see in the House of the Dragon HBO Series. I tried to give the least amount of spoilers and while still portraying the information as it probably will be in the beginning of the series.
During the civil war known as the Dance of the Dragons, Prince Jacaerys Velaryon realised that his mother Queen Rhaenyra Targaryen's faction, the blacks, had many dragons but was in need of dragonriders. He offered lands, riches, and knighthood to any such man that could master a dragon; his sons would be ennobled, his daughters wed to lords.
Targaryen dragon riders are the ones who first united the seven kingdoms and, as was reinforced in this episode, Dany’s dragonfire may be the only hope the realms of men have against the Night King.
Arrax. Arrax was a bold dragon who never lived to see their full potential. Arrax fought the much older and larger Vhagar during a thunderstorm and never stood a chance. Vhagar tore Arrax’s head
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game of thrones dragons and riders