Magnus Aurelius Cassiodorus Senator, commonly known as Cassiodorus, 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, where he worked extensively the last three decades of his life.

Theodoric the Great, also called Theodoric the Amal, was king of the Ostrogoths (475–526), and ruler of the independent Ostrogothic Kingdom of Italy between 493 and 526, regent of the Visigoths (511–526), and a patrician of the Eastern Roman Empire. As ruler of the combined Gothic realms, Theodoric controlled an empire stretching from the Atlantic Ocean to the Adriatic Sea. Though Theodoric himself only used the title 'king' (rex), some scholars characterize him as a Western Roman Emperor in all but name, since he ruled a large part of the former Western Roman Empire described as a Res Publica, had received the former Western imperial regalia from Constantinople in 497 which he used, was referred to by the imperial title princeps by the Italian aristocracy and exercised imperial powers recognized in the East, such as naming consuls.