Ravenna Cosmographer is an anonymous author of a Latin compilation commonly dated to the late 600s to early 700s. The Cosmographer describes the inhabited world, beginning with some theoretical questions and a general overview of the twelve southern and twelve northern regions (Book 1). His extensive lists of locations (Books 2–5) include over 5,000 place names, many otherwise unattested. Following earlier Christian authors such as Orosius, the Cosmographer incorporates Greco-Roman knowledge about the Earth into the framework of Christian scholarship. He cites the Bible and Christian theologians, and he mentions many secular authorities whose names only occur in this text. Although the Cosmographer never acknowledges his use of maps or itineraries, the forms of place names and the arrangement of toponyms by routes in Books 2–5 indicate that he was familiar with these sources. The similarities and differences to the Peutinger Map displayed by the text suggest that these works belong to different branches of the tradition, which ultimately goes back to a common exemplar. The Cosmography preserves the rich legacy of Roman and early medieval geographical knowledge, and its challenging material calls for a fresh examination.
Justa Grata Honoria was the elder sister of the western Roman emperor Valentinian III (reigned 425–455