Aeron Greyjoy is the brother of Euron, Victarion and Balon Greyjoy, the late head of House Greyjoy and the former Lord Reaper of Pyke. He is also the uncle of Yara and Theon Greyjoy. He is a Drowned Man in service to the Drowned God.
Aeron oversees the funeral of Balon Greyjoy after his assassination. When his niece Yara swears on the Salt Throne that she will avenge her father's murder, Aeron reminds her that the King of the Iron Islands must be chosen in the kingsmoot.
Aeron hosts the kingsmoot a few days later, but does not participate. After the ironborn choose Euron Greyjoy to be their new king, Aeron takes him into the sea to be drowned, reciting a prayer as he does so, to consecrate his faith to the Drowned God. Euron is taken ashore and revived, and Aeron places a driftwood crown on his head. He goes with Euron and the ironborn captains to seek out Theon and Yara, and is the first to point out that they have fled in the best ships on the Iron Islands.
Brother to balon and Euron Greyjoy, Aeron is a priest of the Drowned God. He backed Euron's claim to the Salt Throne and officiated at his coronation.