# Research Brief — Roman Commercial Venture ### For: ChatGPT research sessions ### Purpose: Extract historically grounded parameters for OTIVM and CIVICVS simulation ### Date: 2026-04-28 --- ## 0. Before you begin — read this This brief is for a simulation project, not a game with Roman aesthetics. Every parameter you produce will be encoded into a database and used to govern the behaviour of a historically grounded world model. Precision is not optional. Vagueness is actively harmful. **The standard for every claim you make:** - It must be traceable to a named, datable source — archaeological record, primary text, epigraphy, or peer-reviewed scholarship. - It must be scoped to a specific period, region, and social context. "Romans used mules" is not useful. "A laden mule on the Via Appia in the first century BCE could carry approximately X kg at Y km per day under conditions Z" is useful. - Where exact figures are unavailable, give a defensible range with the reasoning behind it. Do not invent precision. Do not smooth uncertainty into false confidence. **On Latin terminology:** Use the Latin term wherever it is academically defensible. Do not default to English equivalents that lose information. If a Latin term carries meaning that English cannot carry in a single word, use the Latin and explain it. The project uses CIVICVS rather than "civic duty" for exactly this reason — the Latin is denser, more precise, and scoped to its period in a way that the English is not. Apply this standard throughout your responses. Write Latin in CAPITALS where the term is being introduced as a canonical token. Once established, mixed case is acceptable in prose. --- ## 1. Context The simulation models a MERCATOR — a Roman merchant — operating in approximately 14 BCE, in the western Mediterranean. The merchant begins in Ostia with 50 denarii and a single CODEX ACCEPTI ET EXPENSI (account book). He conducts NEGOTIA (commercial ventures) along overland and maritime routes. The five locations in scope for the first research phase: | Token | Latin | Modern location | Character | |---|---|---|---| | OSTIA | Ostia | Ostia Antica, Lazio | Port at the mouth of the TIBER. Primary import/export hub for Rome. | | CAPVA | Capua | Santa Maria Capua Vetere, Campania | Major inland market city. Via Appia junction. | | BRVNDISIVM | Brundisium | Brindisi, Puglia | Adriatic port. Eastern trade gateway. End of the Via Appia. | | CARTHAGO | Carthago | Tunis, Tunisia | North African trading centre. Grain, linen, dyes. | | ALEXANDRIA | Alexandria | Alexandria, Egypt | Eastern Mediterranean hub. Grain, luxury goods, knowledge. | --- ## 2. The NEGOTIVM — what we need to understand A NEGOTIVM (commercial venture) is not a single act. It is a chain of discrete ITINERA (legs), each with its own mode, personnel, time, cost, cargo constraint, and failure profile. For each of the four routes below, describe the complete chain of ITINERA from origin warehouse to destination market. For each ITER (leg): **2.1 Mode of transport** - What moved the cargo? IUMENTUM (pack animal — specify species and breed where known), PLAUSTRUM (cart — specify type), NAVIS (vessel — specify type: ACTUARIA, ONERARIA, CORBITA, etc.), human porterage (BAIULI). - What was the road or waterway? Named where possible (Via Appia, Via Ostiensis, Mare Tyrrhenum, etc.). Surface condition, seasonal constraints. **2.2 Cargo unit** - What was the standard unit of cargo for this good on this leg? AMPHORA (specify type: Dressel 1, Dressel 20, etc. — these are not interchangeable), MODIVS (dry measure), TALENTVM, LIBRA. Give weight and volume where known. - What was the maximum load per transport unit (mule, cart, vessel)? - What was the practical load — accounting for personnel provisions, equipment, and the tendency to under-load to reduce spoilage and breakage risk? **2.3 Personnel** - Who was required? The MERCATOR himself, a FACTOR (agent — resident at destination or travelling with the cargo?), BAIULI (porters), MULIONES (muleteer — one per how many animals?), NAVARCHUS (ship captain), NAUTAE (sailors — how many per vessel type?), CUSTODES (guards — under what conditions were they necessary?). - Who was slave (SERVUS), free hired (MERCENNARIUS), or contracted (specify the Roman contractual form where known: LOCATIO CONDUCTIO OPERARUM, LOCATIO CONDUCTIO OPERIS)? - What did each cost per day, per leg, or per NEGOTIVM? **2.4 Time** - Elapsed time from origin warehouse to destination market. Not sailing time — total time including: loading (ONERATIO), waiting for weather or convoy (MORA), transit, customs inspection (PORTORIUM), unloading (EXONERATIO), and market negotiation. - Seasonal variation. The MARE CLAVSVM (closed sea season, roughly November to March) is the hard constraint for maritime legs. What happened to overland legs in winter? In summer heat? **2.5 Cost** - PORTORIUM (customs duty) — rate and collection point. The Roman customs system was farmed to PUBLICANI. Rates varied by region and good. Give the rate where known, the range where uncertain. - VECTVRA (freight charge) — per unit of cargo, per leg. - Personnel costs — daily rates or per-NEGOTIVM fees. - Incidental costs — harbour fees, warehouse rental (HORREUM), road tolls, bribes where documented. - Total cost as a percentage of cargo value where scholarly estimates exist. **2.6 Failure modes** - What could go wrong on this leg, and how often did it? - NAUFRAGIVM (shipwreck) — frequency estimates from archaeological record (Mediterranean wreck distribution is well documented). - Theft (FVRTVM) — on road versus at sea versus in warehouse. - Spoilage — what goods were vulnerable on which legs? Olive oil in summer heat. Wine in transit shock. Grain in damp holds. - Price collapse at destination — how was the MERCATOR exposed to market conditions he could not observe at departure? - Personnel failure — illness, desertion, dishonesty of FACTOR. --- ## 3. The four routes — research in this order ### Route I — OSTIA to CAPVA Primary good: olive oil (OLEUM), fish sauce (GARUM). Character: Short overland leg. Via Ostiensis to Rome, then Via Appia south to Capua. Well-maintained roads. High traffic, therefore lower bandit risk but higher competition and toll exposure. Research note: This route was so heavily trafficked that it is the best documented of the four. Prioritise precision here — it sets the baseline for all subsequent routes. ### Route II — CAPVA to BRVNDISIVM Primary good: Campanian wine (VINVM CAMPANIVM), wool (LANA). Character: Via Appia, the entire length. The most famous road in the Roman world. Overland only. Significant elevation change through the Apennines. Seasonal variation is marked. Research note: Focus on the mule train (AGMEN IVMENTORVM). How was it organised? Who led it? What was the ratio of guards to cargo handlers? ### Route III — BRVNDISIVM to CARTHAGO Primary good: Adriatic grain (FRVMENTVM), amber (SVCCINUM). Character: Maritime crossing of the Ionian Sea, then coastal navigation to North Africa. The amber is not local — it arrived in Brundisium from the north via intermediary traders. Document the amber's known provenance chain and where the MERCATOR entered it. Research note: The SVCCINUM provenance chain is of particular scholarly interest. Trace it as far back as the evidence allows. This is the first route that connects Roman commerce to pre-Roman and non-Roman worlds. ### Route IV — CARTHAGO to ALEXANDRIA Primary good: North African linen (LINVM), frankincense (TVS). Character: Maritime, coastal, longest leg. North African coast eastward. TVS originated far outside the Roman world — document the known intermediary chain from Arabia to Carthage. Research note: This route connects Roman commerce to the Arabian and Indian Ocean trade networks. The MERCATOR at this point is the end consumer of a supply chain that begins thousands of kilometres and potentially thousands of years from Rome. --- ## 4. OTIUM — the other half of the merchant's time OTIUM is not idleness. It is the deliberate withdrawal from NEGOTIVM for the purpose of restoration, reflection, relationship-building, and civic participation. Cicero wrote extensively on this. It was a moral and social category, not merely the absence of work. Research the following: - What did a Roman merchant of modest means actually do during OTIUM? Not a senator's OTIUM — a working MERCATOR's OTIUM. - What social obligations (OFFICIA) competed with OTIUM? Client relationships (CLIENTELA), religious duties, guild membership (COLLEGIUM — was the MERCATOR likely a member of one? Which?). - What was the relationship between OTIUM and AVCTORITAS? How did visible leisure — the right kind, in the right company — build reputation and therefore future commercial opportunity? - What did OTIUM cost? Not in money, but in opportunity. What NEGOTIVM could not be conducted while the MERCATOR rested? --- ## 5. Output format requested For each route and each ITER, produce a structured parameter table: | Parameter | Value | Unit | Confidence | Source | |---|---|---|---|---| | Transit time | X | days | high/medium/low/estimated | Author, Title, date or excavation reference | | Cargo capacity per mule | X | kg | ... | ... | | VECTVRA rate | X | denarii per amphora | ... | ... | | PORTORIUM rate | X | % of cargo value | ... | ... | | Crew size (NAVIS type) | X | persons | ... | ... | | Shipwreck probability | X | per voyage | ... | ... | Follow each table with a prose note covering: what is well-attested, what is inferred, what is genuinely unknown and why. The confidence column is mandatory. Do not suppress uncertainty. A "low" confidence value honestly reported is more useful than a "high" confidence value that conceals a guess. --- ## 6. Sources to prioritise Primary sources (use where they give quantitative data): - Cicero's letters (EPISTVLAE AD ATTICVM, AD FAMILIARES) — commercial references are scattered but precise when present - Digest of Justinian — commercial law, contract types, liability - Diocletian's Edict on Maximum Prices (301 CE — later than our period but gives relative price structures) - Pliny the Elder, NATVRALIS HISTORIA — cargo weights, goods, routes Archaeological sources: - Monte Testaccio amphora deposit, Rome — olive oil trade documentation - Mediterranean shipwreck distribution (Parker 1992 is the standard reference) - Pompeii and Herculaneum commercial records Secondary scholarship: - Lionel Casson, *Ships and Seamanship in the Ancient World* (1971) - Peter Garnsey and Richard Saller, *The Roman Economy* (1987) - Nicholas Purcell on the Mediterranean trade system - Willem Jongman on Roman economic history --- *Research brief — OTIVM / CIVICVS project* *Every parameter produced becomes a database record. Precision is not optional.*