(An). The notification of the route followed by a traveller. The Itinerary of Antoninus marks out all the main roads of the Roman Empire, and the stations of the Roman army. The Itinerary of Peutinger (Tabula Peutingeriana) is also an invaluable document of ancient geography, executed A.D. 393, in the reign of Theodosius the Great, and hence called sometimes the Theodosian Table.
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894