Euron was the younger brother of Balon Greyjoy and Victarion Greyjoy, and became the King of the Iron Islands after a successful Kingsmoot following the death of Balon. During his reign he abandoned the Ironborn Invasion of the North and instead elected to focus on a new campaign, directed towards the fertile, untouched lands of The Reach. He is initially successful and captures the shield islands and begins to directly threaten Highgarden and its surrounding lands.
Euron was eventually slain when The Reach was able to regroup and retaliate against the Ironborn, after they seized victory in the Siege of King's Landing and against Tywin Lannister. The Ironborn would be repelled and Euron himself slain in the Battle of the Shields.