Lady Lyanna
From A Wiki of Ice and Fire
The Lady Lyanna is a war galley in service at King's Landing.
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A Clash of Kings
The Lady Lyanna was part of the fleet Tyrion Lannister sent to bring Myrcella Baratheon to Braavos. If the fleet spotted any lone ship they were to run it off or destroy it. Should an enemy fleet give battle the Bold Wind would escort the Seaswift to safety while the rest of the fleet, consisting of the King Robert's Hammer, Lionstar and Lady Lyanna, would give battle.