See J. J. O'Donnell, Cassiodorus (1979).
(born 490, Scylletium, Bruttium, kingdom of the Ostrogoths—died circa 585, Vivarium Monastery, near Scylletium) Historian, statesman, and monk who helped preserve Roman culture after the collapse of the Roman Empire. He was secretary to Theodoric and later held other high imperial offices. Soon after 540 he founded a monastery to perpetuate the culture of Rome. He collected pagan and Christian manuscripts and had the monks copy them, establishing a practice continued in later centuries. His own works included the Chronicon, a history of mankind to 519; De anima, on the soul after death; and Institutiones divinarum et saecularium litterarum, on the study of scripture and the seven liberal arts.
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James O'Donnell notes:
There is no mention in Cassiodorus' selection of official correspondence of the death of Boethius.
Athalaric died in early 534, and the remainder of Cassiodorus' public career was engulfed by the Byzantine reconquest and dynastic intrigue among the Ostrogoths. His last letters were drafted in the name of Witigis. Cassiodorus' successor was appointed from Constantinople.
Around 537-38, he left Italy for Constantinople where he remained almost two decades, concentrating on religious questions. He noticeably met Junilius, the quaestor of Justinianus. His constantinopolitean journey contributed to the improvement of his religious knowledge.
He spent his career trying to bridge the cultural divides that were causing fragmentation in the 6th century between East and West, Greek culture and Latin, Roman and Goth, and Christian people with their Arian ruler. He speaks fondly in his Institutiones of Dionysius Exiguus, the calculator of the Anno Domini era.
In his retirement he founded the monastery of Vivarium on his family estates on the shores of the Ionian Sea, and his writings turned to religion. The twin structure of the Vivarium was to permit coenobitic monks and hermits to coexist. Cassiodorus also established a library where, at the very close of the classical period, he attempted to bring Greek learning to Latin readers and preserve texts both sacred and secular for future generations. As its unofficial librarian, Cassiodorus not only collected as many manuscripts as he could, he also wrote treatises aimed at instructing his monks in the proper uses of reading and methods for copying texts accurately. In the end, however, the library at Vivarium was dispersed and lost, though it was still active ca. 630, when the monks brought the relics of Saint Agathius from Constantinople, to whom they dedicated a spring-fed fountain shrine that still exists.

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