Salladhor Saan is a Lyseni pirate and long time acquaintance of Davos Seaworth.
He enters the service of King Stannis Baratheon early in the War of the Five Kings, with his ships serving as the rear guard during the Battle of the Blackwater. As Stannis is short on money to pay Salladhor, he gives him the concession on shipping to King's Landing, allowing him to stop ships and charge a percentage of the cargo as a fee for right of way.
Much of Salladhor Saan's fleet was destroyed in a storm, causing him to abandon Stannis and his cause and return to a life of piracy.