From A Wiki of Ice and Fire
Seven Skulls is an ironborn longship and part of the Iron Fleet.
A Dance with Dragons
Seven Skulls is part of the Iron Fleet contingent dispatched to Slaver's Bay. Seven Skulls and Thrall's Bane capture a fishing ketch, whose master tells Victarion Greyjoy that Daenerys Targaryen has flown away on her dragon, beyond the Dothraki Sea.
- ↑ 1.0 1.1 A Dance with Dragons, Chapter 63, Victarion I.