He was born at
Prusa (now
Bursa), in the Roman province of
Bithynia (now part of northwestern
Turkey). His father, Pasicrates, seems to have bestowed great care on his son Dio's education. At first he lived in Prusa, where he held important offices, composed speeches and other
rhetorical and
sophistical essays, and studied
philosophy. The
Stoic and
Platonist philosophies, however, appear to have had the greatest charms for him, particularly the stoicism of
Musonius Rufus. He went to
Rome during
Vespasian's reign (69–79 AD), by which time he seems to have got married and had a child. He became a critic of the Emperor
Domitian, who banished him from Rome,
Italy, and Bithynia in 82 for advising one of the Emperor's conspiring relatives. He claims that, on the advice of the
Delphic oracle, he put on the clothes of a
beggar, and with nothing in his pocket but a copy of
Plato's
Phaedo and
Demosthenes's
On the False Embassy, he lived the life of a
Cynic philosopher, undertaking a journey to the countries in the north and east of the
Roman Empire. He thus visited
Thrace,
Mysia,
Scythia, and the country of the
Getae, giving orations. He was a friend of
Nerva, and when Domitian was murdered in 96 AD, Dio used his influence with the
army stationed on the frontier in favour of Nerva. Under Emperor Nerva's reign, his exile was ended, and he was able to return home to Prusa. He adopted the surname Cocceianus, reflecting Nerva's
nomen, Cocceius. Dio addressed his four
Orations on Kingship to Nerva's successor,
Trajan, and appears to have known the Emperor personally, claiming "I am perhaps as well acquainted with your character as anyone." He knew
Apollonius of Tyana and
Euphrates of Tyre. In his later life Dio had considerable status in Prusa, and
Pliny the Younger reports that he was involved in a lawsuit about a civic building project around 111. He probably died a few years later. ==Writings==