In 514, Cassiodorus became Consul, a title which, while no longer standing for any authority, was still held to be one of the highest honours, and in 515 he received the title of patrician. In 519, he published, under the title of Chronicon, an abstract of history from the deluge to the year 519. Hodgkin points out that in his record of events of the fifth century, a very large measure of favourable, or rather of partial attention is given to the annals of the Goths. Shortly after the publication of the Chronicon, Cassiodorus began work on his History of the Goths, which was finally completed in twelve books, and the chief purpose of which was to vindicate the claims of the Goths to rank among the historic nations of antiquity, by bringing them into connection with Greece and Rome, and by making the origin of Gothic history Roman. This history of Cassiodorus is known only by tradition, not a single copy of it having been preserved. The system of scribe-work in the monasteries, to which we owe nearly all of the old-world literature that has come down to us, did not prove adequate to preserve the greatest work of its founder. A treatise on the origin of the Goths by a later writer named Jordæus, concerning whom little is known, is avowedly based upon the history of Cassiodorus, and is the principal source of information concerning the character of this history.

At the time of the death of Theodoric, Cassiodorus was holding the important place of Master of the Offices, a post which combined many of the duties that would to-day be discharged by a Home Secretary, a Secretary of War, and a Postmaster-General. Under the regency of Queen Amalasuentha, Cassiodorus received his final official honour in his appointment as Prætorian Prefect. In the collection of letters published under the title of Variæ, Cassiodorus gives accounts of the work done by him in these various official stations, and these letters present vivid and interesting pictures of the methods of the administration of the kingdom, and also throw light upon many of its relations with foreign powers.

Cassiodorus continued to do service as minister for the successors of Amalasuentha, Athalaric, Theodadad, and Witigis, and retired from official responsibility only a few months before the capture of Ravenna by Belisarius, in 540, brought the Ostrogothic monarchy to an end. At the time of the entry of the Greek army, Cassiodorus, now a veteran of sixty years, was in retirement in his monastery in Bruttii (the modern Calabria). It was doubtless because of the absence of Cassiodorus from the capital, that no mention is made of him in the narrative of the campaign written by Procopius the historian, who, as secretary to Belisarius, entered Rome with the latter after the victories over Witigis.

Cassiodorus must have possessed very exceptional adaptability of character, not to say elasticity of conscience, to be able, during a period extending over nearly half a century, to retain the favour of so many of the successive rulers of Italy and apparently to make his services necessary to each one of them. It is certain, however, that Italy benefited largely by the fact that through the various contests and changes of monarchs, it had been possible to preserve a certain continuity of executive policy and of administrative methods. The further fact that the “perpetual” or at least the continuing minister was at once a Greek and a Roman, and not only a statesman but a scholar, and that he had succeeded in preserving through all the devastations of civil wars and of foreign invasions a great collection of classic books and a persistent (even though restricted) interest in classic literature, exercised an enormous influence upon the culture of Europe for centuries to come. The career of Cassiodorus had, as we have seen, been varied and honourable. It was, however, his exceptional fortune to be able to render the most important and the most distinctive service of his life after his life’s work had apparently been completed.

Shortly after his withdrawal to Bruttii, and when, as said, he was already more than sixty years old, he retired to his monastery, Vivaria, and during the thirty-six years of activity that remained for him, he not only completed a number of important literary productions of his own, but he organised the literary work of the monastery scriptorium, which served as a model for that of Monte Cassino, and, through Monte Cassino, for the long series of Benedictine monasteries that came into existence throughout Europe. It was the hand of Cassiodorus which gave the literary impetus to the Benedictine Order, and it was from his magnificent collection of manuscripts, rescued from the ruins of the libraries of Italy, that was supplied material for the pens of thousands of monastic scribes.

After his retirement to Bruttii, Cassiodorus founded a second monastery, known as Mons Castellius, the work of which was planned for a more austere class of hermits than those who had associated themselves together at Vivaria. Of both monasteries he retained the practical control, and, according to Trithemius (whose opinion is accepted by Montalembert) of Vivaria he became abbot.[13] Hodgkin, while himself citing the extract from Trithemius, thinks it possible that Cassiodorus never formally became abbot, but says that the direction and supervision of the work of the two monasteries rested in any case in his hands.[14]

His treatise on the Nature of the Soul (De Anima) was probably completed just before he began his monastic life, and was itself an evidence of the change in the direction of his thoughts and of his ideals. Cassiodorus had now done with politics. As Hodgkin points out, the dream of his life had been to build up an independent Italian State, strong with the strength of the Goths, and wise with the wisdom of the Romans. It is evident that he also felt himself charged with a special responsibility in preserving for later generations the literature and the learning of the classic world. With the destruction of the Gothic kingdom, that dream had been scattered to the winds. The only institutions which retained a continuity of organisation were those belonging to the Church, and it was through the Church that must be preserved for later generations the thought and the scholarship of antiquity. It was with a full understanding of this change in the nature of his responsibilities, that Cassiodorus decided to consecrate his old age to religious labours and to a work even more important than any of his political achievements: the preservation, by the pens of monastic copyists, of the Christian Scriptures, of the writings of the early Fathers, and of the great works of classical antiquity.

Some years before his retirement from Ravenna, Cassiodorus had endeavoured to induce Pope Agapetus (535-536) to found a school of theology and Christian literature at Rome, modelled on the plan of the schools of Alexandria and Nisibis. The confusion consequent on the invasion of Italy by Belisarius had prevented the fulfilment of this scheme. The aged statesman was now, however, planning to accomplish, by means of his two monasteries, a similar educational work.

Hodgkin summarises the aims of earlier monasticism, (aims which were most fully carried out in the monasteries of the East and of Africa,) as follows: In the earlier days of monasticism, men like the hermits of the Thebaïd had thought of little else but mortifying the flesh by vigils and fastings, and withdrew from all human voices in order to enjoy an ecstatic communion with their Maker. The life in common of monks like those of Nitria and Lerinum had chastened some of the extravagances of these lonely enthusiasts, while still keeping in view their main purpose. S. Jerome, in his cell at Bethlehem, had shown what great results might be obtained for the Church of all ages from the patient literary toil of one religious recluse. And finally, S. Benedict, in that Rule of his, which was for centuries to be the code of monastic Christendom, had sanctified work as one of the most effectual preservatives of the bodily and spiritual health of the ascetic.

“It was the glory of Cassiodorus,” says Hodgkin,[15] “that he first and pre-eminently insisted on the expediency of including intellectual labour in the sphere of monastic duties.... This thought [may we not say this divinely suggested thought?] in the mind of Cassiodorus was one of infinite importance to the human race. Here, on the one hand, were the vast armies of monks, whom both the unsettled state of the times and the religious ideas of the age were driving irresistibly into the cloister; and who, when immured there with only theology to occupy their minds, became, as the great cities of the East knew only too well, preachers of discord and mad fanaticism. Here, on the other hand, were the accumulated stores of two thousand years of literature, sacred and profane, the writings of Hebrew prophets, Greek philosophers, Latin rhetoricians, perishing for want of men with leisure to transcribe them. The luxurious Roman noble with his slave amanuenses multiplying copies of his favourite authors for his own and his friends’ libraries, was an almost extinct existence. With every movement of barbarian troops over Italy, whether those barbarians called themselves the men of Witigis or of Justinian, some towns were being sacked, some precious manuscripts were perishing from the world. Cassiodorus perceived that the boundless, the often wearisome leisure of the convent might be profitably spent in arresting this work of denudation, in preserving for future ages the intellectual treasure which must otherwise inevitably have perished. That this was one of the great services rendered by the monasteries to the human race, the most superficial student has learned, but not all who have learned it know that the monks’ first decided impulse in this direction was derived from Cassiodorus.”