Dagmer

Dagmer, frequently known by his nickname, Dagmer Cleftjaw, is a character in Game of Thrones. He will debut in the second season and is played by Ralph Ineson.

Dagmer is an ironborn raider and reaver, the commander of his own longship, noted for his skill in battle and his loyalty to House Greyjoy.

In the books
In the Song of Ice and Fire novels, Dagmer Cleftjaw is the captain of the Foamdrinker and is remembered fondly by Theon Greyjoy from his childhood. Dagmer is a solid and dependable commander, but has been known to take gambles if he believes the reward is great enough. A longaxe blow shattered his jaw as a child, leaving him with four lips rather than two and an enormous scar, the source of his nickname.