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

House Lannister is the only one of the great houses we knew from "Game of Thrones" (other than the Targaryens, of course) that we were sure before the show's premiere would have some major characters in "House of the Dragon." Two Lannisters are in the main cast, with actor Jefferson Hall portraying both Jason Lannister, the Lord of Casterly Rock, and his sly, politically-minded twin, Tyland. Viewers meet both brothers in the third episode. By the end of the season, Tyland has plotted with Otto Hightower to put Aegon on the throne, and both Lannister brothers back the greens.