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A Clash of Kings
Magister Illyrio Mopatis sends Saduleon, Joso's Prank and Summer Sun to Qarth to bring Daenerys Targaryen back to Pentos in preparation for her return to Westeros. Daenerys accepts, but insisted in renaming the ships as Balerion, Meraxes, and Vhagar in homage of the three powerful dragons of Aegon the Conqueror.
A Storm of Swords
Daenerys orders her small fleet to head for Slaver's Bay. At one point, she offers all three ships as payment for her Unsullied. On the shores of Slaver's Bay, Daenerys orders her fleet broken up to provide the wood needed by her army for instruments of war for the siege of Meereen.