An important mathematician, astronomer, Master of Arts (1390) and Doctor of Medicine Křišťan of Prachatice is an author of the first Latin Herbarium of Bohemian origin. The treatise is preserved in its original Latin version (7 manuscripts) as well as in Czech translation (11 copies) and has never been printed. Nevertheless, the Latin and the Czech versions of the Herbarium that were traditionally ascribed to Křišťan contain texts of different authors. The main purpose of the project is to study all latin manuscripts and to determine the following: 1. Which is the original version of the Herbarium, and which are its later adaptations? 2. Which of the texts have nothing in common with the Herbarium and were transmitted as a work of Křišťan of Prachatice only because of his reputation? 3. To what extent do the individual versions vary as regards the number of lemma and their content? 4. What is the relationship between the Latin and the Czech versions of the Herbarium?

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