Allard Seaworth
From A Wiki of Ice and Fire
Allard Seaworth is the second son of ser Davos Seaworth, and the rashest. He is the captain of the Lady Marya.
In ACOK
During the cremation of the statues of the Seven on the orders of Melissandre, he expresses his disappobation, but only in low voice. Like his father and his brother Dale, he is charged but the king Stannis to issue and the coasts the writing accusing the queen [Cersei]] of an incestuous relationship with her brother ser Jaime, thus denying the legitimacy of her children to the throne, making Stannis the rightful king of the Seven Kingdoms. Allard leaves for the Free Cities
He dies during the Battle of the Blackwater