
Common law, also known as case law, is deeply rooted in stare decisis, a Latin term for to stand by things decided. It is a legal system that relies on previous rulings and decisions, or precedents, to determine the outcome of a case. Common law originated in medieval England, specifically in the King's Court (Curia Regis) after the Norman Conquest in 1066. Over time, it spread throughout the British Isles and later to the colonies of the British Empire. Today, common law forms the legal system of many countries, particularly former British colonies, and is often contrasted with civil law, which is prevalent in continental Europe and former French, Dutch, German, Spanish, and Portuguese colonies. While civil law is based on a comprehensive code of statutes, common law is more flexible and allows for interpretation, adapting to new trends and situations not contemplated by the legislature.
| Characteristics | Values |
|---|---|
| Origin | Common law originated in the early Middle Ages in the King's Court (Curia Regis) in medieval England. |
| Basis | Common law is based on stare decisis, a Latin phrase meaning "to stand by things decided". |
| Nature | Common law is deeply rooted in precedent and unwritten laws. |
| Flexibility | Common law is more flexible than civil law, allowing for interpretation and revision of laws without legislative intervention. |
| Evolution | Common law evolves gradually over time, reducing disruptive effects. |
| Judicial Role | In common law systems, judges interpret and apply the law, creating new legal principles through their rulings. |
| Binding Decisions | Decisions of higher courts are typically binding on lower courts in the same jurisdiction. |
| Scope | Common law systems are found in many countries, including the United States, the United Kingdom, and former British colonies. |
| Marriage Recognition | Common law recognises non-ceremonial marriages, granting similar rights to couples without a marriage license. |
| Contract Freedom | Common law provides extensive freedom of contract, with fewer implied provisions. |
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What You'll Learn

Common law marriage
Common law, also known as case law, is a legal principle that relies on detailed records of previous rulings and statutes to determine how to proceed with a case at hand. This is because there is no official legal code that can be applied to a case at hand. The judge presiding over a case determines which precedents apply to that particular case. The example set by higher courts is binding on cases tried in lower courts. This system promotes stability and consistency in the U.S. legal justice system.
In the United States, common-law marriage has existed since colonial times, when America was still a colony of England. Common-law marriage is recognized in seven states and the District of Columbia. Additionally, nine states recognize common-law marriage with some restrictions. States that allow for common-law marriage can create their own rules for who qualifies. Common requirements for common-law marriage states include living together for a period of time, although there is no statutory requirement for the length of time a couple needs to live together. The court considers the amount of time a couple lives together on a case-by-case basis. Generally, the longer a couple lives together, the stronger their case is for common-law marriage.
In Canada, while some provinces may extend to couples in marriage-like relationships many of the rights and responsibilities of a marriage, they are not legally considered married. They may be legally defined as "unmarried spouses" and, for many purposes, such as taxes and financial claims, are treated the same as married spouses. In Scotland, common-law marriage does not exist, although there was a type of irregular marriage called 'marriage by cohabitation with habit and repute' which could apply to couples in special circumstances until 2006. In ancient Greece and Rome, marriages were private agreements between individuals and estates.
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Precedent and interpretation
Common law, also known as case law, relies on detailed records of previous rulings on similar situations and statutes. This is because there is no official legal code that can be directly applied to a case at hand. The judge presiding over a case determines which precedents apply to that particular case. The example set by higher courts is usually binding on cases tried in lower courts. This system promotes stability and consistency in the legal justice system.
However, lower courts can choose to modify or deviate from precedents if they are outdated or if the current case is substantially different from the precedent case. Lower courts can also choose to overturn the precedent, but this rarely occurs. Common law draws from institutionalized opinions and interpretations from judicial authorities and public juries. The goal of common law is to establish consistent outcomes by applying the same standards of interpretation. In some instances, precedent depends on the case-by-case traditions of individual jurisdictions, resulting in variations of common law between districts.
In common law, precedent plays a decisive role. Precedent, also known as stare decisis, is a Latin phrase that means "to stand by things decided". In other words, courts and judges need to follow earlier decisions and rulings when dealing with similar cases later. This means that if a court makes a particular decision based on a specific set of facts, then the court is required to follow that decision if they ever rule on the same or closely related issue. Similarly, decisions made by higher courts are typically binding on lower courts in the same jurisdiction.
In some cases, a single decision can create a precedent. For example, a single statutory interpretation by the highest court of a state is generally considered originally part of the statute. Precedent is generally established by a series of decisions. Precedents can influence the decisions of later courts in various ways. In the civil law tradition, precedents are often used to tip the balance in favour of particular outcomes, but they are also used as a means to illustrate how a legal point has been dealt with before.
Common law courts are not absolutely bound by precedent. They can, with good reason, reinterpret and revise the law without legislative intervention to adapt to new trends in political, legal and social philosophy. The common law evolves through a series of gradual steps, so that over a decade or more, the law can change substantially but without a sharp break, reducing disruptive effects.
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Common law origins
Common law, also known as case law, originated in England in the early Middle Ages. It emerged in the King's Court (Curia Regis), a single royal court set up for most of the country in Westminster, near London. The common law established a unified legal system, gradually replacing local folk courts and manorial courts.
The English common law of the Middle Ages was not based on substantive rights but procedural remedies. Over time, these remedies evolved into the modern system, where rights are prioritised over procedure. The common law of England was largely shaped in the centuries following the Norman Conquest of 1066, though Anglo-Saxon law did not disappear overnight. The Anglo-Saxons, especially after the reign of Alfred the Great (871), had a body of rules similar to those used by the Germanic peoples of northern Europe. Local customs governed most matters, and the church played a significant role in government.
Under the Norman rule, serious wrongs were treated as public crimes, punishable by death and property forfeiture. This period of colonial rule by the mainly Norman conquerors brought about other changes, such as the allocation of land to the king's feudal vassals. The efficient government of the Anglo-Norman realm may have resulted from the legacy of Anglo-Saxon institutions or the ruthlessness of the Norman invaders, or a combination of both.
The common law system then spread across the British Isles, first to Wales, then to Ireland, and later to overseas colonies by the British Empire. Many former colonies, including the United States, still retain the common law system today. Common law is characterised by its reliance on precedents and is centred on the principle of stare decisis, a Latin term meaning "to stand by things decided". This principle requires courts and judges to follow precedents set by previous rulings when dealing with similar cases. While common law allows for some interpretation, civil law, in contrast, centres on a comprehensive code of statutes that outline procedures and punishments.
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Common law today
Common law, also known as case law, is a legal system that relies on detailed records of similar situations and statutes because there is no official legal code that can be applied to a case at hand. It draws from institutionalized opinions and interpretations from judicial authorities and public juries. Common law places an emphasis on precedent while allowing some freedom for interpretation. The value of a common-law system is that the law can be adapted to situations that were not contemplated at the time by the legislature.
Today, approximately one-third of the world's population lives in common law jurisdictions or in mixed legal systems that integrate common law and civil law. Many former colonies retain the common law system today, including the United States, which originally based its common law rules on English common law. In fact, every U.S. state — with the exception of Louisiana — has a common law legal system. Common law is also still in effect in the UK, which operates under a dual system of both common and civil law.
In common law jurisdictions, several stages of research and analysis are required to determine "what the law is" in a given situation. First, one must ascertain the facts. Then, one must locate any relevant statutes and cases. Then, one must extract the principles, analogies, and statements by various courts to determine how the next court is likely to rule on the facts of the present case. More recent decisions and decisions of higher courts or legislatures carry more weight than earlier cases and those of lower courts. Finally, one integrates all the lines drawn and reasons given and determines "what the law is".
Common law is deeply rooted in stare decisis, a Latin phrase that roughly means "to stand by things decided". In practice, this means that courts and judges need to follow earlier decisions and rulings when dealing with similar cases later. For example, if a court makes a particular decision based on a specific set of facts, then the court is required to follow that decision if they ever make a ruling on the same or closely related issue. However, lower courts can choose to modify or deviate from precedents if they are outdated or if the current case is substantially different from the precedent case. In a ""case of first impression" with no precedent or clear legislative guidance, judges are empowered to resolve the issue and establish new precedent.
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Common law contracts
Common law, also known as case law, is a legal system that relies on detailed records of similar situations and statutes. This is because there is no official legal code that can be applied to a case. Instead, the presiding judge determines which precedents apply to a particular case. This means that common law draws from institutionalised opinions and interpretations from judicial authorities and public juries.
In the United States, two primary sources of law govern contracts: the common law and the Uniform Commercial Code (UCC). The UCC contains two sets of rules for contracts: one for everyone and one for merchants. Common law governs contracts for services and contracts not otherwise governed by the UCC, such as contracts with real estate, insurance, intangible assets, and employment.
Common-law contracts can be either bilateral or unilateral. They must contain offer, acceptance, and consideration. Offer and acceptance together form mutual assent. The offer must include the agreement's essential elements, which must be definite and certain. The acceptance must be a mirror image of the offer to constitute valid acceptance. Additionally, to be enforceable, the contract must be for a legal purpose, and the parties must have the capacity to enter into the contract. For example, adults of sound mind have the capacity to enter into a contract, while minors lack legal capacity.
In common law, any change to an offer is a rejection and counteroffer. This creates a new offer and changes the person who was initially the offeree to the offeror. A valid contract must also include a description of the quantity, price, performance time, nature of work, and identity of an offer.
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Frequently asked questions
Common law, also known as case law, is a legal system that relies on detailed records of similar situations and statutes. It draws from institutionalized opinions and interpretations from judicial authorities and public juries. Common law originated in medieval England and is now used in many countries, including the United States.
Common law has several key components:
- Precedent: Common law places a strong emphasis on following precedents set by higher courts, although lower courts have some freedom to modify or deviate from these precedents in certain circumstances.
- Interpretation: Common law allows for interpretation and adaptation to new situations, which can be especially important with the evolution of technology.
- Judicial Decisions: Common law is based on judicial decisions and opinions, with judges interpreting and applying the law rather than simply following a written code.
Civil law, which originated in mainland Europe, is a comprehensive, codified set of legal statutes. It provides clear rules for judges to follow and aims for consistency and order. In contrast, common law is more flexible and allows for interpretation. Civil law is typically found in countries that were former French, Dutch, German, Spanish, or Portuguese colonies, while common law is prevalent in former British colonies.














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