Thus far in "House of the Dragon," viewers have only seen three of Queen Alicent and King Viserys's children: Aegon, Helaena, and Aemond. There's been no mention of Daeron, their fourth child and third son. In the books, he's sent as a teenager to Oldtown to serve as cupbearer for his mother's uncle, but it wasn't clear if he had been written out of the show. But on Oct. 11, Martin confirmed in a post on his blog that Daeron does exist on the show and is in Oldtown. "We just did not have the time to work him in this season," he wrote.
Like his siblings, Daeron is a dragonrider, and his mount is Tessarion. In "Fire & Blood," he's described as the gentlest of the three boys. He is also known as Daeron the Daring, and he fights on his brother's side during the Dance of Dragons.