Introduction: Law Beyond the Shore

Long distance water trade in the mediaeval Islamic world was not just about ships, traders, ports and seasonal winds. Ships traversed many nations and were subject to storms, pirates, calamities and emergencies at a distance from the centralised tribunals. They lacked a legal framework to manage risk and resolve disputes.

A merchant with water-damaged cargo arriving in Aden needed a way to determine liability. A skipper whose ship was hit by another in crowded port waters sought rules for compensation. Merchants whose goods had been lost in storms and thrown overboard required an established method of obtaining recompense.

This legal system is known as Maritime Muʿāmalāt, or the maritime application of Islamic commercial law.[1] The Code dealt with issues relating to contracts of carriage, charter parties, loss of cargo, collisions at sea, marine loans, jettison, salvage, and the apportionment of losses between partners.

According to Khalilieh, Islamic maritime law concerned “losses at sea,” including laws governing “jettison and general average, collisions, and the salvaging of jetsam.”

Jettison and salvage were two of the most important legal concepts. Jettison was the purposeful throwing of cargo overboard to save a distressed vessel, whereas salvage was the recovery of ships or cargo following a maritime tragedy. These regulations, combined, formed a legal framework that allowed trade to continue in the absence of courts and centralised enforcement.

This meant that maritime trade was less dependent on direct state intervention and more on common legal customs recognised between ports, ships and merchant communities.

Maritime Muʿāmalāt: Commerce Governed by Law

In Islam, the law of the sea is considered part of the muʿāmalāt, which governs social and commercial transactions.[2] Traditional commercial law applies to the land trade. But the perils of the seas required some rules and procedures for maritime trade.

If there was a difficulty, a merchant conducting business in the city might file an appeal with the court. However, a sea trader could not. They had to make quick decisions – often in the middle of storms and attacks or for emergency navigation – without courts, witnesses or documented enforcement. This is a significant departure from maritime law. It needed to be eaten before the voyage began.

This framework covered:

• shipping-freight lease deal
• freight contracts and shipping commitments
• harbour dues and levies
• liability for damage to goods
• shipwreck
• jettisoning in trouble
• salvage of ships and goods lost at sea
• sharing of losses among investors and traders

Khalilieh cites Kitāb Akriyat al-Sufun wa’l-Nizāʿ bayna Ahlihā (“The Treatise on the Leasing of Ships and the Claims between Contracting Parties”) as one of the first Islamic legal texts that deal with maritime disputes and shipping contracts. The emergence of this legislation suggests that marine law had already evolved into a specific topic of law in early Islamic jurisprudence.

Disputes over damaged goods, unpaid bills, violated goods contracts, and emergency sacrifices were all resolved in predictable ways, and the system lasted.

Jettison: Sacrifice for Collective Survival

The Principle of Jettison

Jettison is a good example of the complexity of maritime laws. Goods may be thrown overboard in an emergency, such as adverse weather, overcrowding, enemy attack, or the risk of sinking, to preserve the ship and its crew.[3]

This produced a major legal quandary.

If the loss of one merchant’s goods would save everyone, which cargo should it be?

Islamic maritime law addressed this problem through the concept of general average, which meant that the loss should not be borne solely by the owner of the sacrificed goods. Anyone who benefited from the voyage’s survival was obligated to make a proportionate contribution.

The principle of the law was simple enough:

• Goods are lost by one shipper.
• Since the ship doesn’t sink, everyone wins.
• That’s why everyone should help pay for the loss.

The captain could move quickly, and the merchant was willing to make sacrifices because he understood he was legally obligated to compensate. It should be noted that Khalilieh stresses that the principle of Islamic maritime law that jettison and general average were recognised as official legal concepts.

Commentary from Comparative Maritime Law

The general average was also discovered in Rhodian and Byzantine maritime law. What was unique about Islam was that Muslim jurists incorporated the notion into fiqh rather than considering it as an external economic tradition.

Jettison, therefore, was no longer an improvised emergency practice, but a legally protected means of collective survival.

Valuation of Jettisoned Goods

Jettisoning was more than just throwing cargo overboard; it also had legal repercussions. Another key challenge was determining the worth of the commodities sacrificed.

Is reimbursement based on the first amount you paid? Would it be the value at the point of departure, the nearest port, or the final location where the items would have been sold?

Analysis Khalilieh identifies four major legal approaches to valuation:

• based on the original market’s cost price 
• the point of departure’s price 
• the value at the nearby jettison port 
• the point of arrival’s price

Legal scholars examined notions of fairness or equity in a trade transaction in which value was transferred from one place to another over multiple dates.[4]

Assume a merchant purchased spices cheaply in India and intended to sell them for much greater prices in Cairo. Should compensation be based on the purchase price or predicted profit?

The discussions demonstrate that Islamic maritime law is highly concerned with profit, opportunity cost, and commercial equity.

Salvage: Ownership After Disaster

The Legal Problem of Salvage

If jettison was about deliberate sacrifice, salvage was about recovery from calamity.

Cargo may be adrift, ashore, or partially salvaged from damaged vessels caused by a shipwreck, storm, pirate raid, or unintentional loss. The retrieval of such valuables instantly raised a contentious legal issue: ownership.

Was the finder always the owner? “Was there a price for the rescue?”Can goods salvaged be sold at will?”

These questions served as the foundation for salvage procedures under Islamic maritime law. In the framework of maritime law, Khalilieh notes that jetsam salvage is a legal matter.

Salvage and Incentive Structures

There was a double threat in the salvage without legal protection.

No salvaging workers received anything. Nobody would risk a dangerous rescue.

The Islamic law of the sea attempted to strike a balance between these extremes. It rewarded opportunistic seizures rather than promoting rescues. A trader had to presume that a loss at sea would not result in an immediate loss of title. The salvor wanted to make sure he was compensated for his efforts.[5]

Accordingly, compensation was linked to work, danger and the cost of recovery, not solely to occupancy. Its presence in the Islamic jurisprudence indicates the already established nature of the Islamic maritime law.

Commercial Manipulation, Fraud and Breach

Merchant Fraud in the Maritime Commerce

There was no honesty or mutual cooperation in the marine system. Merchants were regularly subject to fraud, manipulation, breach of agreement, and commercial deception.

False weights, falsified letters of instruction, diluted commodities, hidden cargo damage, false claims of quality, and debt avoidance were all common dangers in long-distance trading.

Maritime law aimed not just to promote trade but also to prevent commercial abuse.

Quality Fraud and False Weights

One of the most frequent commercial conflicts in port cities was over measurements.

Merchants may manipulate:

• Instruments of weighing
• Moisture content of commodities
• Purity of metals
• Quality of Textiles
• Cargo category

A shipment marked as premium pepper may be an inferior blend, and torn cloth may be hidden within a series of outer fabrics.

To determine whether or not fraud had occurred, such disputes required witnesses, inspectors, brokers, and legal evidence.

Debt Evasion and Forged Documents

As the maritime business became more sophisticated, written correspondence and partnership agreements were subject to forgery charges.

A merchant in debt in Aden may be able to continue operating in Calicut or Hormuz for a while before legal claims can be brought against him across jurisdictions.

Uneven Enforcement and Commercial Manipulation

Maritime legislation lessened confusion, but did not eliminate fraud.

Fraud had not disappeared, but legal processes made it controllable enough for trade to continue, as did the commercial system.

Human Life, Cargo, and Legal Priority

Maritime law also addressed the nexus of property and human life.

Saving lives may be more vital than saving cargo in a tragedy. As a result, Islamic marine jurisprudence addressed the responsibility for rescue, recompense for rescue, and the legal status of human rescue in the event of maritime tragedies.

Khalilieh’s broader work on “human jettison” and “life salvage” demonstrates that Islamic and Byzantine maritime law understood duties to save both persons and goods.[6]

In the legal tradition, the protection of life was always more important than the protection of property.

This ethical foundation distinguished maritime law from strictly commercial regulations that were primarily concerned with efficiency or profit.

The “Battle of the Forms” at Sea: Conflict of Laws

Maritime Muʿāmalāt provided a strong framework, but the Indian Ocean was a pluralistic space where Islamic Law often came into contact with Rhodian Custom, Jewish Halakhah, and local port traditions. This led to a “Battle of the Forms ” in the case of a dispute between parties from different legal traditions.

Consider a port like Aden. A Jewish merchant from the Geniza network charters a ship owned by a Muslim captain, but it is salvaged by a Christian crew from a Byzantine ship. What legislation applies if there is a disagreement over the salvage fee?

• Forum Shopping and Customary Synthesis: In many ports, the “law of the port” often served as a mediator between rival legal traditions. Merchants also turned to forum shopping. They sought more favourable courts or legal systems. Seafaring cultures relied on customary maritime practice (ʿurf) to build long-term business trust, drawing on several legal traditions to construct practical settlements.
• Priority of Contractual Obligation: Smart merchants began adding “choice of law” terms to contracts before voyages to specify which legal system would govern disputes. By figuring out in advance who held legal authority, merchants reduced the risk of long-distance business deals.

Law Without Central Courts

Portable Legality and Decentralized Order

The most essential characteristic of Islamic maritime law was that it functioned successfully without continual recourse to centralised tribunals.[7]

In a hurricane, a skipper had to make a hasty decision about whether to abandon cargo.

A merchant with goods on the water could not afford to wait until he arrived at port before taking action.

As a result, the legal order was established through prior agreement and a shared legal culture, rather than immediate court enforcement.

It worked because merchants, captains, shipowners and jurists shared the same ideals before a dispute started.[8]

This system benefited from judicial plurality. Khalilieh argues that Islamic legal practice has tended toward legal pluralism rather than centralised, inflexible judicial rule.[9]

Arbitration, Evidentiary Procedures, and Enforcement

Maritime disputes were rarely fully handled by official tribunals. Commercial enforcement was through arbitration, mediation and negotiated settlement. Merchant arbitrators were frequently prominent merchants, captains, brokers, port officials, and well-known jurists. Arbitration decreased delays and maintained future commercial contacts between the disputing parties.

Evidential Challenges in the Sea

Maritime law also faced serious evidentiary problems because disputes often occurred far from judicial oversight. At sea, cargo damage, emergency unloading, salvage claims and collisions often depended on the testimony of witnesses, cargo manifests, the captain’s records, merchant correspondence and inspection by brokers or customs officials.

As a result, a claim for damaged textiles can rely exclusively on the testimony of skilled warehouse workers, but a collision claim can rest wholly on contradicting testimony from sailors and pilots. As a result, evidential procedure became an essential component of maritime law.

Inconsistent Enforcement and Practical Limitations

Legal Inconsistency throughout the Ports

In the Indian Ocean, the sea law did not work the same way on both sides. Laws were enforced in very varied ways by various ports, kings, courts, and commercial organisations. Some places were quite tight on contracts, while others tolerated bribes and political favouritism. Some kings were always on the lookout for foreign traders, while others intervened at odd periods when it was politically advantageous to do so. So, a legal concept that is accepted in Aden might not be the same in Hormuz, Calicut, or Cambay.

Corrupt Adjudication and Political Interference 

Judicial systems were open to corruption, patronage and political influence. Sometimes, wealthy merchants could influence rulings through their connections with local authorities. Port authorities might slow down the proceedings, toy with the valuations, refuse to recover debts, favour politically connected merchants, or interfere in cargo disputes. Corruption was not an exception but part of the commercial reality.

Jurisdiction is fragmented

Control of the Indian Ocean was still divided.  A debtor who escaped one port may be able to continue operating elsewhere before legal claims are brought against him. Cross-regional enforcement relied heavily on merchant reputation, family networks, commercial pressure and reciprocal cooperation between ports.

Maritime law minimised disorder, but it did not remove inconsistency, corruption, or uneven application.

Maritime Law and the Freedom of the Seas

Economic principles in Islamic maritime law were linked to a broader legal concept, the commonality of waters.

The sea was not ruled by a single monarch. Navigation was a common benefit on which marine traffic depended. Ships needed access to routes that crossed jurisdictions and government boundaries.

“Freedom of navigation within the Indian Ocean existed prior to the European legal principles (i.e. Mare Liberum),” Khalilieh stated. The sea was thus considered a domain of mutual commercial activity rather than a closed domain owned by a country.

These were important for many reasons:

• Merchants needed to use trade routes regularly.
• Shipowners wanted the law to be open rather than closed.
• Traders could not move freely between countries; hence, some form of cross-border transportation was required to conduct business.

In this sense, maritime law regulated not only transactions but also commercial circulation as a whole.

Comparative Perspective: Islamic and Mediterranean Maritime Codes

The notions of jettison and salvage were not invented independently by Islamic jurists. The ideas were already embedded in the maritime law of Rhodes and the Byzantine Empire.

What set the Islamic case apart was the incorporation of maritime custom into Islamic jurisprudence and commercial ethics.

Muslim lawyers didn’t just copy what was done in the Mediterranean; they added the maritime rules to Islamic law. This made it possible for traders to trade across long distances while still following religious law.

Maritime law has lasted because it has become part of business culture, not just because it was made by politicians.[10]

Broader Implications for Global Trade

The concepts of salvage and jettison demonstrate that medieval globalisation was not just about markets, but also about legal coordination among long-distance commercial networks.[11]

However, it is not only academically significant, since it gave rise to:

• predictability 
• trust 
• equal distribution
• motivation to save
• opportunities to exploit
• homogeneity of legal practices across territorial boundaries

Without these legal systems, large-scale marine trade would have been in a state of perpetual instability and strife.

The success of marine commerce sprang not from the absence of danger, but from the legal control of risk.

Conclusion

The procedures of salvage and discard reveal the complications of Islamic maritime law. The maritime muʿāmalāt was a legal system that made international trade in the Mediterranean and Indian Oceans possible. These measures combined make sure that dealers can survive calamities without losing their credibility.[12]

Many merchants used similar legal processes, which were approved by all parties concerned. Overall, this method established uniformity across merchant boats, regardless of jurisdiction or transaction site, and applied only to commodities and cargo carried domestically and internationally to ports worldwide.

However, maritime law has never operated perfectly. Enforcement was unequal, corruption persisted, jurisdictions overlapped, and decisions were frequently politically influenced. 

Nonetheless, maritime law evolved a distinct commercial order across risky maritime conditions. The medieval sea was therefore not an unregulated space, but regulated by contractual practice, customary law and maritime jurisprudence.

References

1.  Islamic Maritime Law , Hassan S. Khalilieh, Islamic Maritime Law: An Introduction, (accessed April 25, 2026).
2.  Abraham L. Udovitch, Partnership and Profit in Medieval Islam, (accessed April 25, 2026).
3.  Hassan S. Khalilieh, Islamic Maritime Law.
4.  Avner Greif, Institutions and the Path to the Modern Economy, (accessed April 25, 2026).
5.  Nicholas G. M. Rodger, The Safeguard of the Sea: A Naval History of Britain, Vol. I, (accessed April 25, 2026).
6. Hassan S. Khalilieh, Islamic Maritime Law.
7. Udovitch, Partnership and Profit in Medieval Islam.
8.  Hassan S. Khalilieh, Islamic Maritime Law.
9. Janet L. Abu-Lughod, Before European Hegemony: The World System A.D. 1250–1350, (accessed April 25, 2026).
10. Olivia Remie Constable, Trade and Traders in Muslim Spain: The Commercial Realignment of the Iberian Peninsula, 900–1500, (accessed April 25, 2026).
11. Janet L. Abu-Lughod, Before European Hegemony.
12. Ibid