Gilthunder

One of the holy knights of the Britannia kingdom. He wishes both to purge traitorous knights and to prove his strength by defeating the seven deadly sins. He specifically wishes to defeat Meliodas whom he once looked up to in order to prove he's surpassed both his father and his killer.

He resides over fort Solgales and blocked off the water supply in Bernia with his sword before Meliodas removed it.