The #HOTD opening is a Targaryen family tree/bloodline represented on King Viserys' Valyria model/diorama.
What an amazing concept design.
The tree obviously starts with Aegon the Conqueror himself. Here you can see the Doom of Valyria represented in his circle and his crown: pic.twitter.com/g0PYyW4QWA

— Balerion's favorite dragonkeeper (@conquerorscrown) August 29, 2022