A Quick Guide to the Many Families of "House of the Dragon"

The warring kings and nobles in "House of the Dragon" have their hands full enough with a human (and dragon) civil war, so it's a good thing the White Walkers aren't also on their list of enemies to deal with. However, the first episode of "House of the Dragon" does introduce the idea that even the Targaryens of old knew the White Walkers and the Long Night were coming. Viserys tells Rhaenyra that Aegon dreamed of the Long Night and that's why he brought dragons to Westeros.