Vickon Greyjoy, Lord of the Iron Islands

From Asoiaf

Vickon of House Greyjoy, Lord Reaper of Pyke, was the first of his house to become Lord of the Iron Islands.

After Harren the Black, last King of the Isles, and his sons perished at Harrenhal Aegon the Conquerer allowed the surviving iron lords to chose who should have the primacy among them. They chose Lord Vickon.