In A Storm of Swords, she goes to Slaver's Bay to purchase an army of Unsullied, highly trained slave soldiers. She agrees to buy every Unsullied in Astapor in exchange for her dragon Drogon. However, she reclaims Drogon and uses the Unsullied to conquer the city. She frees every slave in Astapor, and she then decides to end the slave trade. She sets out for the slave city Yunkai, and she conquers the city with the help of Daario Naharis, a mercenary who betrays the Yunkish. As she marches on the slave city Meereen, she learns that Arstan is actually Barristan Selmy, a knight who betrayed her father, and discovers that Jorah had been spying on her for Robert Baratheon. She feels betrayed and sends them on a near-suicidal mission to capture Meereen, nearly hoping that they will die in the attempt. The two survive, and the mission succeeds. Barristan asks to be forgiven, she pardons him and names him Lord Commander of her Queensguard. Jorah defends his actions and believes he has committed no wrong. Although she desperately wants to forgive him, she cannot and banishes him. With the fall of Meereen, she decides to make for Westeros. However, she learns that Astapor and Yunkai cannot maintain the peace she hoped to bring and decides to stay in Meereen and learn to be a queen.