The treatise known as the Periplous of Pseudo-Skylax survives on 44 pages of a 700-year-old codex in the Bibliothèque Nationale in Paris. The manuscript as a whole comprises a set of geographical texts assembled by Markianos of Herakleia, probably in the sixth century AD. The work describes the coasts of the Mediterranean and Black Sea, beginning at Gibraltar and proceeding clockwise to return to the same place (and a little way down the Atlantic coast of Africa). We do not know the original name of the work. The introduction examines the history of the manuscript, difficulties of interpretation, and what is known about the author. It addresses date, the debate around the measurements used in the text and what its purpose may have been. Finally it discusses what sort of geography the text offers, its literary features, influences and legacy.