From A Wiki of Ice and Fire
|Title||Lord of Sweetport Sound|
|Born||At Sweetport Sound|
|Died||In 299 AC, at Dragonstone|
|Book(s)|| A Clash of Kings (appears)|
A Storm of Swords (mentioned)
A Clash of Kings
Lord Guncer supports Stannis Baratheon's claim to the Iron Throne as his vassal. Stannis complains about Guncer's constant muttering about the will of the Seven. After Melisandre has the sept on Dragonstone burned, Guncer approaches Stannis and tells him he can no longer support his claim. Stannis has him promptly thrown in the cells beneath Dragonstone.