The last part of The Glory of the Duchy of Carniola (with the exception of Book XII which is added) is partly historical in content and is written as a chronicle. The last two books were for 200 years the main textbooks for Slovenian history. There are 814 pages, 5 appendices and 64 illustrations.
Book XII has 134 pages and 13 chapters and is a kind of topography of Croatia. The book describes the fortresses (Karlovac, Senj, Rijeka). In the book Valvasor praises the military abilities of Croatian people and the Uskok people. He has a high opinion about the people of Senj. Though a book itself is a logical continuation of Book XI, the manuscript was written earlier – already in 1686. Older writers and the archives are used as a source. There is one page, 3 larger appendices, and 18 pictures added to the book.
Book XIII was written by Francisci and it tells the story about the Argonauts, Jason, the foundation of Emona, the Illyrian-Japod wars with the Macedonian kings and about the wars with the Romans. There is a lot of writing in the book, which relates to the polemics with Schoenleben. Its 112 pages are divided into 6 chapters with 15 illustrations.
Book XIV is essentially a book of history. In 184 pages divided into 26 chapters, it covers the Roman period, migration of peoples and the time before the Austrian monarchy. The book deals with the same events, people and places as Book V, and also as in Book X about the state princes. Ten illustrations, related to historical themes supplement the text.
Book XV – the last book of the extensive opus is the chronicle of Carniola under Austrian rulers. There are 314 pages in 34 chapters, based on rich archival sources. It is decorated with a picture (Battle of Sisak) and 21 historical illustrations. At the end the editor included 2 unnumbered pages of remarks and corrections. According to the editor Valvasor gives us general information about Carniola and its borders, which can be gleaned from the written and printed reports. Recorded are events such as the beginning of the reign of the Habsburg family, everyday events (the tournaments of Gašper Lamberg), the myths (about the Water man/Povodni mož in Ljubljana that was later used by the poet France Prešeren) and battles with the Turks. The book represents an important source of Slovenian history of the period, marked particularly by Turkish incursions.