From A Wiki of Ice and Fire
|Book(s)|| A Clash of Kings|
A Storm of Swords (Mentioned)
Urzen is an ironborn raider. He is a sinewy man.
A Clash of Kings
Urzen is among the ironborn who raid the Stony Shore. He was part of Theon Greyjoy's force that captured Winterfell. Urzen is among those who abandon Theon when the Northmen arrive to retake Winterfell.