[1] The Itinerary was written by an anonymous author in Rome.
It refers to the monastery of Santo Stefano, and so was written after its completion in the mid-eighth century.
It makes no reference to the Leonine City which was completed about 850, so scholars believe that it was written prior to this.
[4] Historians study the Itinerary to discover information about the activities and motivations of ninth-century pilgrims as well as to add detail to historical knowledge of Roman buildings and institutions.
[5] An appendix to the Itinerary includes transcribed inscriptions from monuments in the city, many of which no longer exist.