Euron Greyjoy

King Euron Greyjoy was the second son of Lord Quellon Greyjoy, the younger brother of Balon Greyjoy and the older brother of Aeron Greyjoy. A commander during the failed Greyjoy Rebellion, Euron went into exile after Balon's defeat at the hands of King Robert I Baratheon. Euron eventually returned to the Iron Islands and murdered Balon (who had once again proclaimed Ironborn independence after the death of King Robert) for his ineffective rule. Euron was eventually chosen to suceed Balon in the Kingsmoot despite his crimes, which ultimately sparked an Ironborn civil conflict between Euron's supporters and Yara Greyjoy's supporters. Euron allied with Cersei Lannister, and fought against the forces of both Yara and Daenerys Targaryen. During the Great War, Euron fled Westeros for the Free Cities, believing the continent to be doomed. Euron eventually allied himself with the Second Triarchy, conspiring to both reclaim his seat and carve out a massive Ironborn Empire in northern and central Westeros. Euron commanded his forces during the War of the Narrow Sea, gaining an infamous reputation after slaying Queen Arya Stark in single combat during the Battle of Storm's End. He was eventually killed by Yara during the Battle of the Crossroads.