Institutions of Roman Law Certification

Course Introduction

Roman law is one of the most influential legal systems in history, shaping the foundations of many modern legal traditions. This course offers a clear and structured introduction to its core institutions, tracing their development from the early Roman Republic to the codification under Justinian.

Through the study of key texts such as the Institutiones of Gaius and Justinian, you will explore how Roman jurists understood law, organized legal concepts, and resolved disputes. The course focuses on essential areas including persons, property, obligations, and legal actions, while also highlighting their lasting impact on contemporary civil law systems.

Designed to be accessible and engaging, this course combines historical context with practical examples and case-based reasoning, helping you not only understand Roman law but also appreciate its continuing relevance today.

Roman Law – Quick Latin Glossary

Core Concepts

• Ius – law / right / justice (general idea of law)

• Lex (leges) – written statute or law

• Ius civile – law for Roman citizens

• Ius gentium – law of nations / common law of peoples

• Ius naturale – natural law (based on reason/nature)

Legal Status & Persons

• Persona – legal person (someone with rights/duties)

• Status libertatis – status of freedom

• Status civitatis – citizenship status

• Status familiae – family status (authority within household)

Property & Things

• Res – thing / property

• Res corporales – tangible things

• Res incorporales – intangible rights

• Res mancipi – important property (land, slaves, animals)

• Res nec mancipi – all other property

• Dominium – ownership

Ownership Rights

• Usus – right to use

• Fructus – right to enjoy profits/fruits

• Abusus – right to dispose or destroy

Obligations

• Obligatio – legal bond/duty

• Creditor – person owed performance

• Debitor – person who must perform

• Dare – to give

• Facere – to do

• Non facere – to refrain from doing

Delicts (Wrongs)

• Furtum – theft

• Rapina – robbery

• Iniuria – insult/personal injury

• Damnum iniuria datum – unlawful damage

Succession

• Hereditas – inheritance/estate

• Heres – heir

• Testamentum – will

• Intestatus – without a will

Procedure

• Actio – legal action/claim

• In rem – against a thing (property claim)

• In personam – against a person (personal claim)

• Legis actiones – early formal procedure

• Formula – written instruction to judge

• Cognitio extra ordinem – imperial procedure

Simple Tip for Memory

• Ius = ideas of law

• Lex = written law

• Res = things

• Actio = legal action

• Obligatio = legal duty

This course introduces the fundamental institutions of Roman law as developed from the early Republic through the classical and Justinianic periods. Using the Institutiones of Gaius and Justinian as a structural guide, students will study Roman legal concepts concerning persons, property, obligations, and actions, and understand their enduring influence on modern civil law systems.

Learning Objectives

By the end of the course, students will be able to:

1. Explain the structure and sources of Roman law
   

2. Identify key legal institutions governing persons, property, and obligations
   

3. Analyze Roman legal rules using case-based reasoning
   

4. Understand the reception of Roman law in modern legal systems
   

5. Use basic Latin legal terminology correctly
   

Course Introduction

Roman law is one of the most influential legal systems in history, shaping the foundations of many modern legal traditions. This course offers a clear and structured introduction to its core institutions, tracing their development from the early Roman Republic to the codification under Justinian.

1. What Is Roman Law?

Roman law is the legal system developed in Rome from:

The foundation of the city (753 BC)

to the reign of Justinian (6th century AD)

It is not just historical law but the foundation of modern civil-law systems.

Roman jurists focused on legal reasoning, not legislation alone.

Roman law refers to the legal system that originated in ancient Rome and was developed by the Roman Empire over many centuries. It is one of the most influential legal systems in history and forms the foundation of many modern legal systems, especially in Europe and Latin America.

At its core, Roman law was a structured set of rules and principles used to govern society—covering areas like property, contracts, family relations, and criminal behavior. One of its earliest formal codifications was the Twelve Tables (5th century BCE), which made laws publicly accessible to citizens.

Over time, Roman law evolved through interpretations by legal scholars and officials. A major milestone came under Emperor Justinian I, who ordered the compilation of existing laws into the Corpus Juris Civilis in the 6th century CE. This collection preserved Roman legal thought and later became the basis for many civil law traditions.

In simple terms, Roman law is important because it introduced ideas like equality before the law, legal rights, and systematic legal reasoning—concepts still central to modern law today.

Roman law refers to the legal system that originated in ancient Rome and was developed by the Roman Empire over many centuries. It is one of the most influential legal systems in history and forms the foundation of many modern legal systems, especially in Europe and Latin America.

At its core, Roman law was a structured set of rules and principles used to govern society—covering areas like property, contracts, family relations, and criminal behavior. One of its earliest formal codifications was the Twelve Tables (5th century BCE), which made laws publicly accessible to citizens.

Over time, Roman law evolved through interpretations by legal scholars and officials. A major milestone came under Emperor Justinian I, who ordered the compilation of existing laws into the Corpus Juris Civilis in the 6th century CE. This collection preserved Roman legal thought and later became the basis for many civil law traditions.

In simple terms, Roman law is important because it introduced ideas like equality before the law, legal rights, and systematic legal reasoning—concepts still central to modern law today.

2. Ius and Lex

Ius (Right / Justice / Law in a broader sense)

• Ius refers to what is just, fair, or right.

• It’s more abstract and philosophical—think of it as the spirit of the law.

• It includes ideas like natural rights, moral principles, and fairness.

• Example: The idea that people should be treated equally reflects ius, even if no specific written rule says so.

Lex (Written law / Statute)

• Lex refers to specific laws that are formally written and enacted.

• It’s concrete and created by an authority (like a legislature).

• These are the rules you can point to in a legal code.

• Example: A traffic law requiring seat belts is a lex.

Key Difference

• Ius = “What is right” (moral/legal principles)

• Lex = “What is written” (formal laws)

Simple Analogy

Imagine a situation where a law (lex) exists but feels unfair:

• The lex might say something very specific.

• But ius asks: “Is this actually just?”

3. Types of Law

Ius civile – law of Roman citizens

Ius gentium – law common to all peoples

Ius naturale – law of nature (philosophical concept)

1. Ius civile

The law specific to Roman citizens

Applied only to members of the Roman state

Very formal and technical

Example: Rules about Roman citizenship, property ownership, or family authority that only applied to Romans.

2. Ius gentium

Literally “law of nations”

A set of rules considered common to all peoples, not just Romans

Developed to handle interactions between Romans and foreigners

It’s less rigid than ius civile and based more on practical fairness and widely accepted customs.

3. Ius naturale

“Natural law”

A philosophical concept—what is naturally right according to reason or nature

Influenced by thinkers like Aristotle

It goes beyond man-made law and asks: What should be just for all humans by nature?

Key Differences (Simple View)

Ius civile → Law for Romans only

Ius gentium → Law for all peoples in practice

Ius naturale → Law based on nature and universal justice

Easy Way to Remember

Think of three levels:

Local law → Ius civile

International/common law → Ius gentium

Universal moral law → Ius naturale

This structure later influenced legal philosophy, especially ideas of natural rights developed by thinkers like Thomas Aquinas.

4. Sources of Roman Law

1. Custom (mos maiorum)

• Means “custom of the ancestors”

• Unwritten rules based on long-standing tradition

• One of the earliest sources of law

Before formal laws, Romans followed tradition as authority.

2. Leges (Statutes)

• Laws formally passed by popular assemblies

• Written and binding

Example: The famous Twelve Tables was one of the earliest statutory laws.

3. Plebiscita

• Decisions made by the Plebeian Council (common people)

• Initially applied only to plebeians, later to all citizens

Became fully binding after reforms like the Lex Hortensia.

4. Senatus consulta

• Decrees or advice issued by the Senate

• Over time, they gained the force of law

Especially important during the later Republic and Empire.

5. Praetorian Edict

• Rules announced by praetors (judges) about how they would administer justice

• Helped adapt rigid law to real-life situations

This made the legal system more flexible and fair.

6. Jurists’ Writings

• Opinions and interpretations by legal scholars

• Highly influential in shaping legal principles

Prominent jurists like Ulpian helped define legal reasoning.

7. Imperial Constitutions

• Laws issued by Roman emperors

• Became the main source of law during the Empire

Included edicts, decrees, and rescripts (official answers).

Quick Summary (Easy to Memorize)

• Custom → tradition

• Leges → laws by assemblies

• Plebiscita → decisions of the people

• Senatus consulta → Senate rulings

• Praetorian edict → judicial guidance

• Jurists → expert opinions

• Imperial constitutions → emperor’s laws

Memory Tip

Think of the evolution:
From tradition → to people → to officials → to emperor

5. Periods of Roman Law

1. Archaic Period (753–367 BC)

• Earliest stage of Roman law

• Law was rigid, formal, and based on customs (mos maiorum)

• Controlled mainly by priests (pontiffs)

• Highly technical procedures

Key feature: Law = tradition + strict rituals

2. Pre-classical Period (367–1st century BC)

• Law becomes more flexible and practical

• Rise of magistrates, especially praetors

• Development of the praetorian edict

• Expansion of Rome → need to deal with foreigners (ius gentium)

Key feature: Adaptation and expansion of law

3. Classical Period (1st–3rd century AD)

• Golden age of Roman law

• Development of sophisticated legal science

• Influential jurists like Ulpian and Gaius

• Clear legal concepts and systematic thinking

Key feature: Refinement and intellectual development

4. Post-classical Period (3rd–6th century AD)

• Decline in legal creativity

• Law becomes more centralized under the emperor

• Simpler, less technical legal reasoning

• Increased use of imperial legislation

Key feature: Simplification and imperial control

5. Justinianic Period (6th century AD)

• Time of Emperor Justinian I

• Compilation of Roman law into the Corpus Juris Civilis

• Preserved and organized centuries of legal development

Key feature: Codification and preservation

Quick Timeline Memory Trick

• Archaic → strict & traditional

• Pre-classical → flexible & expanding

• Classical → peak & sophisticated

• Post-classical → decline & centralized

• Justinianic → codified & preserved

Legal Personality

A persona is someone capable of holding rights and duties.

1. Legal Personality (persona)

• A persona is an entity recognized by law as capable of holding rights and duties.

• In simple terms: someone (or something) that the law treats as a legal subject.

If you can own property, make contracts, or be held responsible, you have legal personality.

Status System

Roman law classified persons according to status

Roman Status System (Status System)

In Roman law, a person’s legal capacity depended on three types of status:

1. Status Libertatis (Freedom)

• Distinguishes free persons from slaves

• Free person → has legal rights

• Slave → no legal personality (considered property)

This is the most important status—without freedom, no rights exist.

2. Status Civitatis (Citizenship)

• Distinguishes Roman citizens from non-citizens (foreigners)

• Roman citizens → full legal rights (e.g., marriage, property, legal actions)

• Foreigners (peregrini) → limited rights, often under ius gentium

3. Status Familiae (Family Position)

• Refers to a person’s position within the Roman family

• Paterfamilias (head of family) → full legal authority

• Alieni iuris (under authority) → limited legal independence

Why It Matters

Your legal personality depended on all three:

• Lose one → your rights change or disappear

• Example: A free non-citizen has more rights than a slave, but fewer than a citizen

Quick Formula (Easy to Memorize) Full legal capacity = Freedom + Citizenship + Family independence

Simple Example

A person with:

• Freedom

• Citizenship

• Independent family status

Has full legal personality

PROPERTY (RES)

SECTION 3: CLASSIFICATION OF THINGS & OWNERSHIP (Roman Law)

Based on Roman Law

1. Classification of Things (Res)

Roman law classified things into four main groups:

(a) Res corporales

These are tangible things—things you can touch or physically hold.
Examples: land, slaves, animals, objects.

(b) Res incorporales

These are intangible things, meaning legal rights rather than physical objects.
Examples: inheritance rights, obligations, servitudes.

(c) Res mancipi

These were the most important forms of property in early Roman law.
They required a formal transfer process.

Included:

• Italian land

• Slaves

• Draft animals (like oxen, horses)

(d) Res nec mancipi

This category included all other property not considered essential.
They could be transferred more easily, without formal ceremony.

Simple Memory Tip

• Corporales = physical

• Incorporales = rights

• Mancipi = important/ceremonial

• Nec mancipi = everything else

2. Ownership (Dominium)

Ownership (dominium) means full legal control over a thing.

In Roman law, ownership is best understood as a bundle of powers—not separate legal categories in practice, but different ways of describing control.

Core Powers of Ownership

Usus

Right to use the thing.

Fructus

Right to enjoy its fruits or profits.

Abusus

Right to destroy, consume, or fundamentally alter it.

Important Clarification (to avoid confusion)

• In strict Roman law, ownership is mainly explained through Usus + Fructus + Abusus

• Possessio (possession) is usually a separate legal concept, not part of ownership itself

• Disposition (selling/transferring) is considered part of abusus, not a separate Roman category

Clean Exam / Script Version (Best to Use)

Ownership (dominium) = Usus + Fructus + Abusus

Final Simple Idea

Roman ownership means:

• You can use it

• You can benefit from it

• You can dispose of it

OBLIGATIONS (OBLIGATIONES)

1. Meaning of Obligation

An obligatio is a legal bond between two persons, where one party is required to perform a duty for the benefit of the other.

In simple terms:
An obligation means someone must do, give, or not do something.

• Creditor → the person who has the right to demand performance

• Debtor → the person who must perform the duty

2. Sources of Obligations

Roman law recognized four main sources:

(a) Contract (ex contractu)

• A legally binding agreement between parties

• Example: sale, loan, lease

Created voluntarily by agreement.

(b) Delict (ex delicto)

• An obligation arising from a wrongful act (tort or crime)

• Example: theft, damage to property

Purpose: compensation for harm.

(c) Quasi-contract (quasi ex contractu)

• Obligations that resemble contracts but are not real agreements

• Example: managing someone’s affairs without being asked

Based on fairness, not agreement.

(d) Quasi-delict (quasi ex delicto)

• Obligations arising from acts that cause damage but are not intentional crimes

• Example: negligence causing harm

3. Characteristics of Obligations

• They are personal rights (between specific individuals)

• They are enforceable by law

• They usually involve performance or compensation

4. Types of Performance

An obligation may require:

• Dare → to give something

• Facere → to do something

• Non facere → to not do something

5. Simple Summary

An obligation in Roman law is:
A legal duty binding one person (debtor) to another (creditor), arising from contract, wrongdoing, or other legal situations.

Memory Line

“Obligations are legal bonds that make someone give, do, or refrain from doing something.”

DELICTS & SUCCESSION

PART A: DELICTS (DELICTA)

1. Meaning of Delict

A delict is a wrongful act that causes harm to another person, giving rise to a legal obligation to pay compensation.

In simple terms:
A delict is a civil wrong, not just a crime, that creates liability.

2. Purpose of Delicts

• To compensate the victim

• To punish wrongful conduct

• To restore balance between parties

3. Main Types of Roman Delicts

(a) Furtum (Theft)

• Unlawful taking of another’s property

• Includes stealing or handling stolen goods

(b) Rapina (Robbery)

• Theft involving violence or force

• More serious than furtum

(c) Damnum iniuria datum (Property Damage)

• Unlawful damage to another’s property

• Example: destroying crops, killing livestock

(d) Iniuria (Personal Injury or Insult)

• Harm to a person’s body, dignity, or reputation

• Includes physical assault or insult

4. Key Idea of Delicts

Delicts create a legal obligation to compensate the victim, not just moral guilt.

PART B: SUCCESSION (SUCCESSIO)

1. Meaning of Succession

Succession is the transfer of a person’s rights and property after death.

In simple terms:
Who gets what when someone dies.

2. Types of Succession

(a) Testamentary Succession

• Based on a will (testamentum)

• The deceased chooses heirs

Example: “I leave my property to my son.”

(b) Intestate Succession

• Applies when there is no valid will

• Property is distributed according to law

Priority usually:

1. Family (children, spouse)

2. Close relatives

3. Extended family

3. Key Concepts in Succession

Heir (heres)

• Person who inherits the estate

• Takes both assets and liabilities

Estate (hereditas)

• Total property, rights, and obligations of the deceased

Universal Succession

• Heir steps into the legal position of the deceased completely

4. Simple Summary

Succession in Roman law decides:
Who inherits a person’s property and obligations after death.

Memory Line

• Delicts = wrongful acts → compensation

• Succession = death → transfer of property

PROCEDURE & LEGACY

PART A: ROMAN CIVIL PROCEDURE

Roman civil procedure describes how legal disputes were brought before courts and resolved in Roman law.

Over time, Roman law developed three main procedural systems:

1. Legis Actiones

• The oldest and most formal system

• Based strictly on fixed legal words and rituals

• Very rigid—one wrong word could lose the case

Key idea:
Law was mechanical and highly formalistic

2. Formulary Procedure

• Introduced more flexibility and practicality

• The praetor issued a written formula defining the legal issue

• Judges followed this formula to decide the case

Key idea:
Law became more adaptable and fair

3. Cognitio extra ordinem

• Meaning “extraordinary procedure”

• Fully controlled by imperial officials or judges

• No fixed formulas—judge had full authority

• Became dominant in the later Empire

Key idea:
Centralized and flexible justice under the emperor

Simple Evolution

Formal → Flexible → Imperial control

PART B: ACTIONS IN ROMAN LAW

Legal claims in Roman law were called actions (actiones).

1. In rem Actions

• Directed against a thing (property)

• Protects ownership rights

Example: claiming ownership of land

2. In personam Actions

• Directed against a specific person

• Based on obligations or contracts

Example: demanding repayment of a loan

3. Penal vs Compensatory Actions

Penal Actions

• Aim to punish wrongdoing

• Often involve fines or penalties

Compensatory Actions

• Aim to repair harm or restore loss

• Focus on compensation rather than punishment

Key Idea

In rem = against things
In personam = against people

PART C: LEGACY OF ROMAN LAW

The influence of Roman law did not end with the fall of Rome—it shaped modern legal systems.

1. Reception in Europe

• Roman legal principles were revived in medieval Europe

• Especially through universities and scholars

2. Influence on Civil Codes

• Roman law became the foundation of modern civil law systems

• Influenced codes in France, Germany, and many other countries

3. Importance for Legal Reasoning

• Introduced structured legal thinking

• Emphasis on logic, classification, and principles

Final Summary

Roman law shaped how we understand law today by providing:
Structured procedures

Clear legal actions
A foundation for modern civil legal systems

Roman law is not just history—it is the intellectual foundation of modern legal systems across Europe and beyond.

Final Summary

Roman law shaped how we understand law today by providing:
Structured procedures

Clear legal actions
A foundation for modern civil legal systems

Roman law is not just history—it is the intellectual foundation of modern legal systems across Europe and beyond.

Roman Law – Quick Latin Glossary

Core Concepts

• Ius – law / right / justice (general idea of law)

• Lex (leges) – written statute or law

• Ius civile – law for Roman citizens

• Ius gentium – law of nations / common law of peoples

• Ius naturale – natural law (based on reason/nature)

Legal Status & Persons

• Persona – legal person (someone with rights/duties)

• Status libertatis – status of freedom

• Status civitatis – citizenship status

• Status familiae – family status (authority within household)

Property & Things

• Res – thing / property

• Res corporales – tangible things

• Res incorporales – intangible rights

• Res mancipi – important property (land, slaves, animals)

• Res nec mancipi – all other property

• Dominium – ownership

Ownership Rights

• Usus – right to use

• Fructus – right to enjoy profits/fruits

• Abusus – right to dispose or destroy

Obligations

• Obligatio – legal bond/duty

• Creditor – person owed performance

• Debitor – person who must perform

• Dare – to give

• Facere – to do

• Non facere – to refrain from doing

Delicts (Wrongs)

• Furtum – theft

• Rapina – robbery

• Iniuria – insult/personal injury

• Damnum iniuria datum – unlawful damage

Succession

• Hereditas – inheritance/estate

• Heres – heir

• Testamentum – will

• Intestatus – without a will

Procedure

• Actio – legal action/claim

• In rem – against a thing (property claim)

• In personam – against a person (personal claim)

• Legis actiones – early formal procedure

• Formula – written instruction to judge

• Cognitio extra ordinem – imperial procedure

Simple Tip for Memory

• Ius = ideas of law

• Lex = written law

• Res = things

• Actio = legal action

• Obligatio = legal duty

Congratulations on completing Institutions of Roman Law.

You have gained a solid understanding of the structure, principles, and legacy of Roman law—knowledge that underpins modern legal systems around the world.

Your commitment to learning is an important step in developing strong legal reasoning and analytical skills.

Keep building on this foundation, and best of luck in your continued studies.