Lucius (or Claudius) Cassius Dio (/ˈkæʃəs ˈdiːoʊ/; alleged to have the cognomen Cocceianus; Greek: Δίων Κάσσιος Κοκκηϊανός Dion Kassios Kokkeianos, c. AD 155–235), known in English as Cassius Dio, Dio Cassius, or Dio, was of Greek origin, Roman consul and noted historian who wrote in Greek.