 After a first mention in "A Game of Thrones" in relation to slavery, Daenerys Targaryen conquers the three great Slaver's Bay port city-states Astapor, Yunkai and Meereen in "A Storm of Swords".She stays in Meereen throughout most of "A Dance with Dragons".The cities were built from the rubble of Old Ghis, an ancient rival of Valyria that was crushed by Valyria thousands of years before the series' events.