Rheagar fights the rebels but is killed by Robert in the Battle of the Trident. (Hence Sansa’s nervousness about Jon and House Stark allying themselves with Daenerys, a Targaryen, in recent seasons of the show.) Houses Stark, Tully, Arryn and Baratheon join forces in the rebellion against Aerys. Lyanna’s oldest brother Brandon rides to King’s Landing to demand justice for his sister, and Aerys executes both Brandon and his father, Rickard. Robert claims that Lyanna was abducted and leads a rebellion against Aerys. Lyanna Stark runs away with Aerys’s son, Rhaegar Targaryen, despite being betrothed to Robert Baratheon. The Andals eventually conquer all of Westeros except for the North, where the Kings of the North and particularly House Stark continue to practice the traditions of the First Men, including worshipping the Old Gods. The Andals believe that the Children of the Forest practiced magic that was antithetical to their faith and kill all but a few of the race.

Each High Septon wields immense power in Westeros, as demonstrated by the face-off between Cersei Lannister (Lena Headey) and the High Sparrow (the High Septon at the time, played by Jonathan Pryce) on the show. The Faith of the Seven becomes the dominant religion in Westeros, as led by the High Septon. Andal warriors carve the symbol of the faith, the Seven-Pointed-Star, into their foreheads. They spread their religion, the Faith of the Seven. The Andals migrate from Andalos in Essos to Westeros, killing and conquering the First Men, south of the Neck over the course of several centuries. HBO The Andal Invasion (6000 BC – 4000 BC)

Game of thrones civilization