Game of Thrones was a great TV show in the beginning – even if it did start cutting material from Martin’s books early on.
Oh, and Rhaenyra's only remaining child, Prince Aegon the Younger, witnesses it. Here's how the moment goes down in Fire & Blood: “Sunfyre, it is said, did not seem at first to take any interest ...
"A regal portent for Prince Aegon's name day." This idea of the stag being a "regal portent" is re-enforced when the king gets an update on the stag's whereabouts from one of his hunters.
Have we seen the last of Aegon (Tom Glynn-Carney ... before his brother Prince Aemond (Ewan Mitchell) comes storming in on the enormous Vhagar to torch both of them, knocking the king out ...