A Clash of Kings Edit
Lord Guncer Sunglass answers the call of Stannis Baratheon in his war against Joffrey I Baratheon. Guncer then announces that he no longer supports Stannis after the burning of the sept and the death of men of House Rambton, for which he is imprisoned. Three Sunglass ships are seized to take part in the Battle of the Blackwater.
A Storm of Swords Edit
During the Battle of the Blackwater, Melisandre and Selyse Florent execute all the prisoners on Dragonstone as a tribute top R'hllor. This includes guncer. His brother, the new Lord of Sweetport Sound, flees to Volantis.