Daemon challenged Aemond, waiting for 13 days at Harrenhal until Aemond stopped burning the Riverlands to come face him. The duel that became known as the Dance over Harrenhal ended in the deaths of both riders and both dragons over the God's Eye. Daemon was 49 when he died.
Daemon Targaryen: Born in 81 AC, Daemon is supposed to be four years younger than his brother, Viserys, according to the chronology in Fire & Blood. Matt Smith, who portrays Daemon, is 39 years old.
In 120 AC at the age of thirty-nine, Daemon married again, this time to his niece, Rhaenyra Targaryen, the twenty-three-year-old Princess of Dragonstone.
According to Fire & Blood (the source material for House of the Dragon), Daemon dies after an epic dragon fight with Prince Aemond… who also dies, womp.
Daemon's age in the show is not explicitly revealed, but neither are we led to believe that his age is significantly different from what it is in George R. R. Martin's books. So, let's agree that he is (give or take) 16 years older than Rhaenyra. This places him in his early 30s when we first see him meet his niece.
According to the accounts of Septon Eustace, prior to her turning sixteen, Rhaenyra lost her virginity to her uncle, Prince Daemon, after he seduced her.
Daemon is 4 years younger than his big brother Viserys, according to GRRM's book.
While we conjectured that something inside forced Daemon to stop before he took Rhaenyra's virginity, a recent HBO-approved “Inside the Episode” installment revealed that something was literally impotence. He literally couldn't get it up.
Aegon III, aka Aegon the Younger: Rhaenyra and Daemon's first child together.
Sunfyre devoured Rhaenyra in six bites, leaving only her left leg below the shin. Prince Aegon the Younger was forced to watch his mother die, and Elinda Massey allegedly gouged out her eyes in horror.
Daemon and Rhaenyra share two children together: Aegon III and Viserys II.
1 Daemon Probably Loves Rhaenyra
However, Fire & Blood gives some insights into Daemon's character, which House of the Dragon only touches on in the last episodes of Season 1. Daemon shows his genuine care and attention to Rhaenyra several times before the two marry.
He chokes Rhaenyra after she starts telling him The Song of Ice and Fire prophecy and learning that Viserys kept secrets from him. Perhaps Daemon's attack was motivated by this perceived betrayal? Part of it also may be related to his dislike of Viserys weakness.
In the seventh episode of the blockbuster HBO series, Prince Daemon marries his own niece, Princess Rhaenyra. The incestuous romance had been building for some time. Before a 10-year time jump occurred in the show's sixth epsode, Daemon took a young Rhaenyra to a brothel in King's Land where the two got intimate.
Balerion the Black Dread
The largest and eldest of all the Targaryen dragons, Balerion was flown by Aegon the Conqueror and later became the steed of King Viserys I.
By House of the Dragon's fourth episode, Rhaenyra is around 18 years old and Daemon is 34. "The idea that a teenage girl is in any way able to consent to that sexual interaction is a mess.
It isn't explicitly stated in the show, but because we learn after episode six that all three boys have dark brown hair — and despite Rhaenyra and Laenor's matching blond color — it has been strongly implied that they are actually the children of Ser Harwin Strong, the Lord Commander of the City Watch.
The shock of the loss of her father, combined with the Greens' ruthless betrayal sends her into early labor. Without modern medicine, a baby born so early had very little chance of survival in the best of circumstances - and in these terrible conditions the baby, a girl named Visenya, is stillborn.
So, who is the real father of Rhaenyra's children? In the show and in George R.R. Martin's Fire and Blood novel, it is heavily implied that Ser Harwin Strong, a knight and the captain of the City's Watch, is the true father of Jacaerys, Lucerys, and Joffrey.
We last saw her find out the truth in "We Light the Way" that Rhaenyra lost her virginity to Ser Criston Cole (Fabien Frankel).
While House Of The Dragon episode 4 showed Daemon was able to seduce Rhaenyra by kissing and undressing her, he couldn't fulfill the act due to impotence.
It was clear that Leana and Laenor had a close relationship, and she likely would not appreciate her uncle choosing this moment to make a statement while her brother grieves. Daemon laughs at this moment because Vaemond is choosing this moment to guilt Rhaenyra for having children with Harwin Strong (Ryan Corr).
In a recent podcast interview with Entertainment Weekly, Paddy Considine — the actor portraying Viserys — revealed that his character has a kind of leprosy. “He's actually suffering from a form of leprosy. His body is deteriorating, his bones are deteriorating. He's not actually old.
Leprosy is a slow moving disease
The show has got the speed of the disease correct. King Viserys has lived with leprosy for many decades and the disease has grown very slowly.
While Daemon might hold complicated feelings for his brother, he loved him in a way that few second sons love their older brothers.