From A Wiki of Ice and Fire
|Book(s)|| A Clash of Kings (Appears)|
A Storm of Swords (Mentioned)
A Clash of Kings
Stygg is among the ironborn who raid the Stony Shore. He is a member of Theon Greyjoy's force that captures Winterfell, during which he slays Mikken. After the capture, Theon sends Stygg to request aid from Asha Greyjoy at Deepwood Motte. Stygg is among those who abandon Theon when Rodrik Cassel's northmen arrive to retake Winterfell.