King Robert's Hammer
King Robert's Hammer is a war galley of four hundred oars in service at King's Landing. It is called Rob's Hammer by its oarsmen. It is the largest ship in service with the royal fleet of the Iron Throne.
A Clash of Kings
King Robert's Hammer is part of the escort Tyrion Lannister sends to bring Myrcella Baratheon to Braavos. If the small fleet spots any lone ship they are to run it off or destroy it. Should an enemy fleet give battle the Bold Wind is to escort the Seaswift while the rest of the fleet, consisting of Rob's Hammer, Lionstar and Lady Lyanna, are to give battle.
A Feast for Crows
After the Blackwater there are less than a dozen warships left in King's Landing, so Queen Regent Cersei Lannister orders the construction of ten new dromonds. Sweet Cersei will be the equal of Rob's Hammer, while Lord Tywin will have twice as many oars.