Aeron Greyjoy is a member of House Greyjoy and a member of the Drowned Men in service to the Drowned God. He is the younger brother of King Balon Greyjoy, and uncle to both Theon Greyjoy and Asha Greyjoy.
Aeron, youngest of the Greyjoy siblings, thought himself a man at only 16 years. Instead, he was a drunkard who wasted his time on simple merriment, and boasted of his drinking and urination prowess.
During his brother Balon's rebellion, the ship he was on sunk at the hands of Stannis Baratheon's fleet. Aeron was presumed lost at sea, but somehow survived and washed ashore. He was then taken to Lannisport in chains as a prisoner of war where he spent the remainder of the Greyjoy rebellion under Lannister lock and key. Upon his eventual return to the Iron Islands Aeron was a changed man. His near-death experience sparked a kind of spiritual awakening in him, causing him to dedicated his life to the Drowned God. Becoming a hermit on the beach, he began spreading the word of this god, and adopted a new name: Damphair. Dedicated holy followers, called Drowned Men, follow his every command, and he is greatly respected by the Ironborn people.
A Feast for Crows
Aeron is busy on Great Wyk baptizing men from the island into the Drowned God faith. He struggles with Emmond, but with the help of Rus and Norjen he manages successfully. He is then visited by the Sparr, Steffarion Sparr and Gormond Goodbrother, who tell him of the death of his brother, King Balon. He then takes Gormond's horse and rides to the Hammerhorn, where he is told by Gorold Goodbrother of the return of Euron Greyjoy. After hearing that his niece, Asha,is pushing her claim he announces that a Kingsmoot is necessary.
The night before the Kingsmoot, Aeron visits the ruins of the hall of the Grey King. He thinks about Nagga and prays to the Drowned God. Aeron gives a speech before the Ironborn, talking of Balon's death. He bares witness to the speeches of Gylbert Farwynd, Erik Ironmaker, and Dunstan Drumm, before calling Victarion forwards.