Greyjoy's Rebellion

From Asoiaf

Balon Greyjoy, Lord of the Iron Islands proclaimed himself King of the Isles, starting Greyjoy's Rebellion. Robert Baratheon, King of the Seven Kingdoms and Eddard Stark, Lord of Winterfell joined forces to defeat him.

During the rebellion Rodrik Greyjoy was slain at Seagard and Maron Greyjoy was slain on the walls of Pyke.

289 AL At night in the castle of Pyke Balon Greyjoy, King of the Iron Islands surrendered to Robert Baratheon, King of the Seven Kingdoms. Balon's son Theon Greyjoy became the hostage and ward of Eddard Stark, Lord of Winterfell.