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This six-volume work, published between 1860 and 1890, contains a selection of documents in Greek which throw light on the history and politics of the Byzantine Empire in the Middle Ages. The editors, Franz Miklosich (1813 91), philosopher, linguist and Slovenian nationalist, and Josef (or Giuseppe) Muller (1823 95), a Greek scholar who also translated many important works by German classical historians into Italian, used as one of their sources the volumes of Greek manuscripts brought back to Vienna by Ogier Ghiselin de Busbecq (1522 92), the Flemish diplomat, herbalist, and travel writer who had acted as Imperial Ambassador to the Sublime Porte. Volume 6 (published in 1890) contains texts relating to the great Orthodox Monastery of St John on Patmos, founded in 1088 by St Christodoulos and dedicated to the author of The Book of Revelation, which was written on the island."