The Romans, and ancient travellers in general, did not use
maps. While illustrated maps existed as specialty items, they were hard to copy and not in general use. Using the
Roman roads, however, the traveller needed some idea of where they were going, how to get there, and how long it would take. The
itinerarium filled this need. In origin, it was simply a list of cities along a road: "at their most basic,
itineraria involve the transposition of information given on
milestones, which were an integral feature of the major Roman roads, to a written script." It was only a short step from lists to a master list. To organize the lists, authors diagrammed parallel lines to show the branches of the roads. Parts of these were copied and sold on the streets: the very best featured symbols for cities, way stations, watercourses, and so on. The maps did not depict landforms, but they served as simple
schematics for the user. The government, from time to time, undertook to produce a master itinerary of all Roman roads.
Julius Caesar and
Mark Antony commissioned the first known such effort in 44 BCE.
Zenodoxus,
Theodotus of Byzantium, and
Polykleitos the Younger, three Greek geographers, were hired to survey the system and compile a master itinerary. This task required over 25 years. The result was a stone-engraved master itinerarium set up near the
Pantheon, from which travellers and itinerary sellers could make copies. ==Vicarello cups==