Book Fourth, Chapters 13 to 22. How Argon was delivered from prison. How Argon got the Sovereignty at last. How Acomat was slain by order of his nephew. How Argon was recognized as sovereign. How Kiacatu seized the sovereignty after Argon's death. How Baidu seized the sovereignty after the death of Kiacatu. Concerning king Conchi. Concerning the land of darkness. Description of Rosia and its people.