From A Wiki of Ice and Fire - A Song of Ice and Fire & Game of Thrones
|Book(s)|| A Clash of Kings|
A Storm of Swords (Mentioned)
A Clash of Kings
Urzen is among the ironborn who raid the Stony Shore. He is part of Theon Greyjoy's force that captures Winterfell. Urzen is among those who abandon Theon when the northmen arrive to retake Winterfell.