the roman 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 bc. zenodoxus, theodotus, and polyclitus, 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 travelers and itinerary sellers could make copies.