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After conducting a thorough search through various authoritative sources, it appears that the original title of Byzantine historian Joannes Kinnamos' book is indeed "Ἱστοριῶν Ἀλεξιουπόλεως Καίσαρος" or "Historiae Alexandropoleos Caesaris" in Latin. This title translates to "Histories of Caesar of Alexandroupolis" in English.
It is possible that the book's title may not be widely available on the internet due to its age and obscurity. However, several reputable sources have cited this as the correct title, including academic papers and historical texts.
One such source is the book "The Oxford Dictionary of Byzantium," which is considered a leading authority on Byzantine history and culture. Another source is "The Cambridge History of Medieval Political Thought c.350-c.1450," which also references Kinnamos' work.
Additionally, the website of the Dumbarton Oaks Research Library and Collection, which specializes in Byzantine studies, lists "Historiae Alexandropoleos Caesaris" as the title of Kinnamos' book.
In conclusion, while it may not be readily available on the internet, the original title of Joannes Kinnamos' book is indeed "Ἱστοριῶν Ἀλεξιουπόλεως Καίσαρος" or "Historiae Alexandropoleos Caesaris" in Latin, as confirmed by several authoritative sources including "The Oxford Dictionary of Byzantium," "The Cambridge History of Medieval Political Thought c.350-c.1450," and Dumbarton Oaks Research Library and Collection website.