Around 1320 BCE, a ship sank near Uluburun on the southern coast of what is now Turkey. It had been carrying copper and tin for bronze production, together with glass ingots, resin, ivory, jewellery, pottery and other objects obtained from distant places. A sponge diver found the wreck in 1982, and archaeologists later recovered a cargo that gives an unusually detailed picture of Late Bronze Age exchange. The cargo preserves evidence of materials exchanged among eastern Mediterranean rulers and trading communities before they were loaded onto the same vessel.
Those goods had very different origins. Cyprus supplied copper, Levantine jars held resin, and some of the amber had already travelled from northern Europe. We do not know where the ship was going or precisely who controlled the shipment. It may have carried property for a palace, independent traders or both. The mixture of goods reflects earlier journeys along several routes, probably involving different traders, before the cargo came together for another crossing.
Ancient trade routes included rivers, coastal passages, open-sea crossings, roads and tracks through deserts or mountains. Some carried goods between nearby towns; others joined markets separated by thousands of kilometres. Every journey depended on practical arrangements: finding a buyer, raising money, arranging carriers, locating safe harbours and water, and reaching agreements with people who could protect a shipment or demand payment. Networks shifted as political conditions and ports changed, and as sailors drew on their knowledge of seasonal winds. The routes depended on repeated journeys and negotiations, and changed when ports, rulers and markets changed.
The first long-distance routes existed before the Silk Road
People exchanged materials over large distances long before anyone used the name Silk Road and before states maintained elaborate roads. In the Neolithic, obsidian from Anatolian volcanic sources reached communities in the Levant. Its sharp edges made the glass valuable for tools. The obsidian establishes that material passed between distant communities, although it cannot identify the individual travellers who carried it. Pieces could pass through several communities, exchanged or given as gifts at successive stops.
Aegean coastal communities were also exchanging goods before the rise of Bronze Age palaces. Late fourth-millennium BCE excavations at Kephala Petras in eastern Crete have revealed imported materials and traces of craft production. Yiannis Papadatos and Peter Tomkins argue that coastal settlements could improve their position among neighbouring communities by controlling access to resources brought from elsewhere. Their study in the American Journal of Archaeology describes how sheltered landings, boats and dependable contacts could connect a community with distant suppliers without requiring a royal harbour or major engineered road.
With the expansion of towns and states in Mesopotamia, Egypt and the Indus, demand grew for raw materials that could not always be obtained nearby. Timber, metals and stone might be brought in, while food surpluses, cloth and manufactured objects were sent out. Rivers were especially useful for transporting heavy consignments where boats could navigate, and sea routes extended movement beyond the rivers’ mouths. The combination of geography, transport and political control differed across regions and periods. Each network operated under its own practical and institutional constraints.
Bronze Age Mediterranean trade: the Uluburun ship and royal gifts
Few ancient wrecks preserve the variety of goods found at Uluburun. The Institute of Nautical Archaeology excavated the site during eleven seasons between 1984 and 1994. The vessel carried approximately ten tonnes of copper and a tonne of tin, close to a familiar ratio for making bronze. Many of the copper ingots had four projecting corners and are known as oxhide ingots because of their shape. The corners made the heavy pieces more manageable; the name does not mean that the metal was transported inside animal hides.
Alongside the ingots were Canaanite jars, coloured glass, ivory, jewellery and objects linked to several regions. Archaeological reconstructions show how heavy pieces of metal could be positioned low in the hull to help keep the ship stable. The finds reveal the scale and some practical details of maritime exchange. They cannot identify the owner, the harbours visited or the intended destination. Both royal business and private trade are possible within a trading world in which goods from several suppliers could travel together.
Written correspondence from Amarna, the Egyptian capital established under Akhenaten, reveals another side of Late Bronze Age connections. The Amarna tablets were composed mainly in Akkadian during the fourteenth century BCE and include letters between the Egyptian court and foreign kings. The ruler of Alashiya, usually associated with Cyprus, called the Egyptian king his brother while discussing copper shipments and what he expected in return. A letter in the British Museum, EA 34 mentions copper, an ebony bed, a chariot, horses, linen and oil. Gifts between rulers carried diplomatic meaning, but supplying them also involved miners, craftspeople, transporters and officials.
Those letters are evidence for relationships among royal courts and the obligations rulers negotiated. Their gifts should not automatically be treated as the equivalent of merchants buying and selling in a marketplace. Tribute, diplomacy, private consignments and palace redistribution could all operate alongside one another. The Amarna letters preserve what rulers said about exchange, while the Uluburun wreck preserves objects that were physically moved. The letters record political obligations, while the shipwreck demonstrates movement of goods that may also have involved private merchants.
Tin illustrates the difficulty of identifying where a cargo originated. Cyprus and other Mediterranean regions provided copper, whereas suitable tin deposits were less common. A 2022 isotope study proposed that much of the Uluburun tin originated in Anatolia and Central Asia. In 2023, Daniel Berger and colleagues challenged that attribution, arguing that south-west Britain could have supplied part of the cargo and that chemical comparisons did not allow a certain answer. Work published in 2025 has added independent evidence for British tin reaching the eastern Mediterranean, without determining the provenance of every Uluburun ingot. Regardless of which sources supplied this ship, bronze production relied on bringing copper and tin together across distances that cannot yet be mapped shipment by shipment.
The Assyrian caravans: a trade route recorded in merchants' own words
Merchants’ own documents provide unusually detailed evidence for certain overland routes. In the early second millennium BCE, traders linked Ashur, an Assyrian city in Mesopotamia, with markets in central Anatolia. At Kültepe, ancient Kanesh in modern Turkey, excavations have uncovered more than 23,000 clay tablets and envelopes in private buildings. The merchant quarter, called the kārum, belonged to a larger commercial network. Its documents describe shipments, partnerships, debts, arguments and messages sent between relatives, offering a much closer view of business than the victories celebrated in royal inscriptions.
Tin and textiles were important goods carried from Ashur to Anatolia, where merchants sought silver and other products. Donkey caravans travelled for weeks through difficult country. Traders needed to purchase animals and provisions, pay for fodder and guides, and reach agreements with authorities along the road. A caravan account in the Metropolitan Museum of Art lists investments in textiles and tin as well as the expenses of the animals and their feed, ending with an amount owed to a named trader. It even contains a small error in the arithmetic. They record what a caravan cost to equip and what the people financing it expected to recover.
A single merchant rarely handled every stage of the journey and sale. Relatives and partners in Ashur or Anatolian towns could organise production, extend credit, send instructions and hire carriers. Women in Ashur took part in the textile economy and in decisions affecting family businesses. Some people travelled great distances, while others remained at home or arranged for goods to pass between agents. The Kanesh archives document this particular system in detail. They do not establish that every caravan network in every ancient society functioned through an identical sequence of intermediaries.
An expedition also depended on credit, political protection and reliable business partners. Written contracts recorded credit and obligations; local rulers could protect travelling merchants or levy taxes; partners had to be trusted to pay. If animals died, cargo was stolen or a debtor defaulted, a carefully arranged venture might still fail. Many of the Kanesh tablets survived because houses burned and their clay records were fired by the heat. The disaster preserved letters and accounts from people who spent months separated from their families and whose income rested on decisions made in distant markets.
Palmyra and the desert routes between Rome and Mesopotamia
Palmyra became an important trading city because it occupied an oasis in the Syrian desert. Under Roman rule, its merchants helped connect Mediterranean markets with settlements along the Euphrates, the Persian Gulf and trading regions farther east. To cross the desert, caravans relied on local support. They needed dependable water sources, animals suited to the journey, guides who knew the routes and agreements with people capable of protecting travellers or controlling passage through particular territories.
Palmyrene inscriptions honour people for organising caravans or helping them travel safely. They reveal the influence of commercial families and patrons, and the role of public recognition in the city’s civic life. A 2024 scholarly survey of Palmyrene trading networks traces Palmyrene commercial agents to places including Egypt, Yemen and Pakistan. Their distribution shows how far Palmyrene contacts reached; it does not establish that one caravan travelled from the Mediterranean to India. Merchants and cargoes could move between different overland and maritime routes, including those passing through the Persian Gulf and Indian Ocean.
An inscription from Palmyra dated to 137 CE records a bilingual tax tariff. It is sometimes interpreted as a detailed schedule of charges for every great caravan travelling across Asia. The recent analysis of the tariff instead explains its principal concern with municipal taxation. It consequently provides evidence for local city revenues and disputes over duties. It does not provide a reliable formula for calculating what a merchant paid to move silk across the entire continent.
Palmyra’s temples, wealthy households and civic authorities were involved in the setting in which merchants worked. Traders dedicated objects in sanctuaries, and scholars have asked whether religious institutions also helped raise or distribute commercial capital. Temples may have played such a role, although the evidence does not establish that they acted as courts for traders of every origin. The city’s commercial position arose through desert geography, negotiations with political authorities and the opportunities created by exchange between the Roman and Parthian worlds.
The Indian Ocean: sailing with the monsoon
Across the Arabian Sea, sailors timed voyages around winds that reversed with the seasons. During the northern summer, south-westerly monsoon winds could carry vessels from Arabian and African ports towards India. North-easterly winds during the northern winter helped them return. Successful navigation also required knowledge of local currents, safe anchorages and the time needed to wait for favourable conditions. Communities around the Indian Ocean accumulated that experience over generations. That knowledge came from accumulated regional experience and cannot be attributed to one foreign navigator.
Later accounts associate a navigator named Hippalus with the discovery of a direct crossing of the Arabian Sea. That attribution does not demonstrate that he was the first person to understand the monsoon, or that Arabian and Indian sailors knew nothing of it beforehand. Direct voyages between Roman Egypt and western India became important during the first centuries BCE and CE. They formed part of a maritime world whose practical knowledge and experience were shared among many communities.
The anonymous Greek-language Periplus of the Erythraean Sea, usually dated to the middle of the first century CE, describes trade around the Red Sea, eastern Africa, Arabia and India. The translation hosted by the University of Washington makes available its account of sailing seasons, rulers, ports and goods. It names places such as Barygaza, near present-day Bharuch, and Muziris on India’s Malabar coast, and discusses where merchants could trade pepper, pearls, ivory, textiles and other products. Its author also describes places to anchor and goods accepted in exchange. The author compiled practical information, some of it possibly second-hand, rather than narrating one complete voyage.
Berenike, on Egypt’s Red Sea coast, provides physical evidence of the contacts described in such texts. Established under the Ptolemies in the third century BCE, the port remained active under Roman rule and afterwards. Excavators have recovered peppercorns, goods made in India and evidence suggesting the presence of people with South Asian cultural connections. A 2025 study of Indian objects from Berenike examines religious representations and a bilingual Sanskrit-Greek dedication found there. The finds document travellers, craftspeople and religious traditions associated with these journeys alongside the imported goods.
Landing at an Egyptian port was one stage in a much longer commercial journey. Goods from the Red Sea crossed the Eastern Desert by land, reached the Nile and then travelled north towards Alexandria. The second-century CE Muziris papyrus sets out arrangements for cargo arriving from India, including transport, the rights of a financier and the customs dues attached to imports. It offers rare details about who paid and who bore particular risks. The economic network therefore included desert carriers, river transport, creditors, warehouses and officials as well as the sailors who crossed the sea.
Elsewhere in the Roman world, coastal navigation also benefited from permanent structures. The Tower of Hercules at A Coruña on Spain’s Atlantic coast was built in the late first century CE. Its original Roman masonry remains within a building that has undergone extensive restoration. The UNESCO site record describes the site as an unusual surviving Roman lighthouse that continues to serve maritime signalling. Although far from the Indian Ocean routes, the lighthouse demonstrates how a permanent coastal landmark could aid ships approaching a difficult shore.
What travelled: metals, silk, spices and grain
Cargo weight affected which routes made economic sense. Gemstones, incense and fine cloth could produce a large return from a relatively small package, even after a risky journey. Grain, stone and common pottery were heavy compared with their value. Moving them overland by pack animal could become expensive, particularly over long distances. Where a river or sea passage was available, boats could move far greater quantities of such goods. The relation between value, weight and transport costs shaped what traders could profitably move by land or water.
Copper and tin illustrate the dependence of workshops on distant materials. Bronze required both, and the regions producing large quantities of one metal were not necessarily those providing the other. The Uluburun vessel also held resin, glass, amber and ivory, which had their own customers and uses. Its cargo combined raw materials for workshops with expensive finished objects. Copper and tin could be made into practical tools, and imported raw materials supplied ordinary production at workshops far removed from the places where they were extracted.
For the Roman state, grain was a particularly important bulk commodity. Imports from North Africa and Egypt travelled by sea to feed Rome, especially after Augustus brought Egypt under Roman authority in 30 BCE. The annona was the organised supply system through which grain was acquired, transported, stored and distributed. Shipowners and merchants called navicularii helped carry shipments for the state, while warehouses at Ostia, Portus and Rome handled the cargo. A survey of Roman shipowners and the grain supply examines their relationship with public contracts. Estimates of annual deliveries differ, and a figure of 400,000 tonnes cannot be treated as an uncontested measured total.
Ports and ships handled mixtures of cargo, even when some routes were particularly important for grain or other bulk goods. The Antikythera wreck from the first century BCE contained amphorae, sculptures, glassware and an extraordinary geared instrument now known as the Antikythera mechanism. The shipwreck’s excavated assemblage reveals the diversity of material transported on the vessel. The mechanism demonstrates complex Hellenistic astronomical technology. Nothing in the wreck establishes that merchants routinely used such instruments for navigation. Some objects on the ship may have been intended for rich buyers; others had more everyday functions.
The roads, ports and agreements that made trade possible
Distance was only one obstacle for ancient merchants. They also had to allow for the time goods spent on the road, spoilage, theft, payments and unfamiliar political demands. Road construction improved movement without eliminating the need for supplies, lodging and secure passage. Mountain passes, river crossings and harbours became particularly valuable because travellers had to use them. Authorities and local intermediaries could charge dues, offer protection or interrupt transport. Conditions at mountain passes, river crossings and harbours could determine whether a route was commercially viable.
Roman roads joined administrative centres, towns and military posts throughout the empire. Traders benefited from them, although military and government needs were often major reasons for their construction. The surviving Tabula Peutingeriana depicts routes and stopping places as a connected network. Its schematic layout records connections and stopping places without preserving their geographic proportions. The manuscript copied during the Middle Ages preserves an older, late antique way of showing routes and the stations between them.
Merchants also needed agreed methods for measuring goods and recording debts. Balance weights found aboard the Uluburun ship show one way quantities could be compared, while the Kanesh letters and accounts document shipments and obligations. Standards varied between societies, forcing traders to understand unfamiliar systems of weight, value and payment. Seals and marked vessels could identify a consignment’s owner or show whether it had been opened. Their meanings depended on local practice, however; no universal ancient international currency or single set of commercial measures bound every route together.
Legal protection was similarly local. A merchant’s rights might depend on the city or kingdom in which the transaction occurred, personal status or ties to a powerful patron. A cargo-backed loan enforceable under one set of rules might be difficult to recover elsewhere. Guides, business partners and intermediaries could therefore matter as much as written contracts. People trading across political and linguistic boundaries learned to make agreements under different authorities. Business could continue across these boundaries when the participants agreed on the terms of a particular transaction, despite the absence of one legal system for everyone involved.
The Silk Roads were several routes, not one road across Asia
The phrase Silk Road was invented in the nineteenth century to describe far older networks linking parts of China, Central Asia, South Asia, Iran and lands farther west. In the plural, Silk Roads better conveys the reality of shifting paths through oases, mountain passes and steppe corridors. Their use depended on political conditions, settlement patterns, local demand and the ability to cross difficult terrain. Merchants could trade profitably along one portion of the network without travelling from China to the Mediterranean.
Silk attracted attention, but traders also transported horses, other textiles, metals, food, paper and many additional goods. A large share of exchange took place within regions or between neighbouring markets. Goods could be bought and sold successively at oasis towns rather than carried by one merchant over the whole distance. Monks, soldiers, envoys and migrants used overlapping routes and spread religious traditions, technologies and artistic forms. In The Silk Road: A New History, Valerie Hansen draws on surviving oasis documents to show the importance of local trade and military spending. The oasis documents reveal substantial local exchange and military spending alongside any long-distance commerce.
Maritime journeys formed other Asian trading networks with different practical demands. The Indian Ocean commerce described by the Periplus relied on knowledge of seasonal winds, coasts and ports, whereas Central Asian caravans confronted deserts, high passes and local political arrangements. Their goods and merchants could meet through inland markets and coastal cities. Central Asian land routes and Indian Ocean shipping remained distinct systems with different seasonal and geographic constraints.
How ancient trade routes changed when kingdoms fell
The failure of eastern Mediterranean palace states around 1200 BCE damaged some existing forms of long-distance exchange. The royal connections visible in the Amarna correspondence and the wealthy cargo represented by Uluburun changed as their political setting broke down. Other communities continued to produce and trade. Excavations at Porto Rafti in eastern Attica, reported in Antiquity in 2023, reveal maritime exchange and production after the Mycenaean palaces collapsed. Exchange continued in some communities despite the failure of the Mycenaean palaces.
In the early first millennium BCE, Phoenician communities and other sailors helped develop contacts across the Aegean and farther into the western Mediterranean. Archaeologists are still investigating how those routes related to the networks of the preceding Bronze Age. Some ports and political centres changed, and some trading practices may have continued through different intermediaries. Research on Phoenician activity in the early Iron Age Aegean points to the participation of Cypriots and other groups alongside Phoenicians. The archaeological record instead points to changing participants and routes, without a two-century halt followed by a Phoenician restart.
Empires could redirect trade, protect routes or collect taxes on commerce that had developed before their rule. Roman control of Egypt gave the imperial government new opportunities along Red Sea routes, but merchants had sailed across the Indian Ocean for generations before Rome arrived. If a kingdom ceased to protect a desert track, travellers might seek new guides, markets or alternative passages. Political stability could make commerce easier, while local knowledge and demand allowed traders to adapt when rulers and borders changed.
The Uluburun vessel never arrived at the harbour for which it was bound. Its wreck preserved goods from several economies on the seabed for more than three thousand years. The Amarna letters reveal royal negotiations, the Kanesh tablets expose merchants’ calculations, and contracts from Roman Egypt show how imported cargo was financed and taxed. Each source records a different part of the transactions involved in moving goods. Across the ancient world, traders and officials decided what to acquire, how to move it, how much risk to accept and where to sell. Those agreements and journeys connected distant communities through many overlapping networks, without a single authority directing all trade.
