The tragic passing of Rhaenyra’s son Lucerys was shown in the season 1 finale of House of the Dragon. Sadly, the loss of his younger brother will be more tragic.
Much though the loss of Lucerys Velaryon in the House of the Dragon season 1 finale was distressing, the loss of Joffrey Velaryon will be even more painful. After leaving Storm’s End on his horse, Lucerys Velaryon perished when Aemond Targaryen’s dragon, Vhagar, devoured him in midair. Lucerys’ demise wasn’t necessarily rapid due to the sheer size of Vhagar, whose neck Tyrion Lannister claimed more than a century later to be big enough for a horse to ride down her gullet.
It’s obvious that having a dragon’s mouth chomp down on him would have left him gravely crippled, but it can’t be believed that he died as soon as he was sucked up by Vhagar and then consumed. No of how long Lucerys had been alive after being devoured, his death was abrupt and brutal.
The Dance of the Dragons, the historic Westerosi civil war that the program is based on, formally begins with Vhagar’s vicious House of the Dragon attack, which makes it much worse. As a result, more horrifying and tragic deaths will occur in the future, with Joffrey Velaryon, the son of Queen Rhaenyra, becoming one of the unlucky casualties. Joffrey perishes in Fire & Blood, the book that served as the inspiration for House of the Dragon, when he tries to ride Rhaenyra’s dragon Syrax out of the Dragonpit and tumbles off of her.
He plunges 200 feet into Flea Bottom, and his fall is made worse when he strikes a roof and drops another 40 feet. Joffrey is swarmed by the smallfolk of Flea Bottom, who tear him to pieces after he is severely hurt and impaled with various objects, including his sword through his stomach. Unlike Lucerys, who passed away peacefully, Joffrey’s passing is accompanied by terrible incidents that build upon one another.
In House of the Dragon, when will Joffrey Velaryon pass away?

However, Syrax’s death will coincide with Joffrey’s in the crucial Dance of the Dragons event known as the Storming of the Dragonpit in 130 AC. Syrax’s engagement in the House of the Dragon’s fight will not be totally focused on combat. After Joffrey dies, Syrax goes back to Rhaenys’ Hill to battle the crowd being led by “The Shepherd,” a strange anti-Rhaenyra proselytizer. In House of the Dragon, Joffrey’s demise may not happen until after the Storming of the Dragonpit. The Storming of the Dragonpit might not occur until season 3 or, at the very least, the end of season 2 if House of the Dragon devotes its remaining four seasons to the Dance of the Dragons.
What Percentage Of Rhaenyra’s Children Survive House Of The Dragon

Rhaenyra’s offspring will be engaged in battle because of how important their mother is to House of the Dragon. The battle will formally begin with the death of her son Lucerys, and her other sons Joffrey and Jacaerys will soon follow. But not all of Rhaenyra’s offspring will perish in the Dance of the Dragons, as King Viserys predicts in House of the Dragon. Aegon and Viserys, the two youngest sons of Rhaenyra and Daemon, will one day both occupy the Iron Throne.
When Aegon II passes away from poison in 131 AC, Aegon will replace him, putting an end to the House of the Dragon’s conflict. Aegon III will, however, be a melancholy king with a terrible reign because to the tragic battle. After spending a considerable amount of time in Essos, his brother Viserys returns to Westeros in 134 AC and will act as Hand of the King for Aegon III and his nephews Daeron I and Baelor I. He would become King Viserys II in 171 A.D.