Magnus Aurelius Cassiodorus Senator (c. 485 – c. 585), commonly known as Cassiodorus (ˌkæsioʊˈdɔːrəs), was a Christian, Roman statesman, renowned scholar of antiquity, and writer serving in the administration of Theodoric the Great, king of the Ostrogoths. Senator was part of his surname; not his rank. He also founded a monastery, Vivarium (or "Castellum"), where he worked extensively the last three decades of his life.
Cassiodorus was born at Scylletium, near Catanzaro in Calabria, Italy. Some modern historians speculate that his family was of Syrian origin based on his Greek name. His ancestry included some of the most prominent ministers of the state extending back several generations. His great-grandfather held a command in the defense of the coasts of southern Italy from Vandal sea-raiders in the middle of the fifth century; his grandfather appears in a Roman embassy to Attila the Hun, and his father (who bore the same name) served as comes sacrarum largitionum and comes rerum privatarum to Odovacer and as Praetorian Prefect to Theoderic the Great.
Cassiodorus began his career under the auspices of his father, about in his twentieth year, when the latter made him his consiliarius upon his own appointment to the Praetorian Prefecture. In the judicial capacity of the prefect, he held absolute right of appeal over any magistrate in the empire (or Gothic kingdom, later) and the consiliarius served as a sort of legal advisor in cases of greater complexity. Evidently, therefore, Cassiodorus had received some education in the law. During his working life he worked as quaestor sacri palatii c. 507–511, as a consul in 514, then as magister officiorum under Theoderic, and later under the regency for Theoderic's young successor, Athalaric. Cassiodorus kept copious records and letterbooks concerning public affairs. At the Gothic court his literary skill, which seems mannered and rhetorical to modern readers, was so esteemed that when in Ravenna he was often entrusted with drafting significant public documents.