I am currently studying the writings, library, and circle of Lupus of Ferrières. A selection of ca. 130 documents survives in an original manuscript (Paris, lat. 2858) compiled from Lupus's archives shortly after his death (after June 862). The letters are a key source for the history of books, libraries, and the movement of scholars and learning in the ninth century. We can tell a great deal about Lupus and his activities. He was, for instance, a key vector in the transmission of Cicero's works. I am finishing a fresh edition, commentary, and translation of Lupus's letters and related documents, where I relate the letters to events, recovered persons, and extant manuscripts or indirect evidence of them.