Lord of the Waters
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This information has thus far been released in a sample chapter for The Winds of Winter, and might therefore not be in finalized form. Keep in mind that the content as described below is still subject to change.
Presumably he is Aurane Waters, former Grand Admiral to Queen Regent Cersei Lannister, who ordered the construction of a fleet of dromonds and crewed them with criminals, then fled King's Landing with the warships after Cersei's arrest.