
Common law, also known as case law, is a legal system that originated in England during the Middle Ages. It is a body of unwritten laws based on legal precedents established by the courts and has been administered by the common-law courts of England since the Middle Ages. Common law draws from institutionalized opinions and interpretations from judicial authorities and public juries. It is still very much in effect in the US and is also practiced in the UK, Australia, Canada, Hong Kong, India, New Zealand, and other Commonwealth countries.
| Characteristics | Values |
|---|---|
| Definition | Common law is a body of law based on court decisions rather than codes or statutes (also known as case law). |
| Origin | Common law originated in England during the Middle Ages, specifically after the Norman Conquest of 1066. |
| Influence | Common law influences legal systems in the US, UK, Canada, Australia, New Zealand, Hong Kong, India, and other Commonwealth nations. |
| Basis of Decisions | Common law relies on detailed records of similar situations and statutes, with an emphasis on precedent and allowing some freedom for interpretation. |
| Adaptability | Common law can adapt to situations not contemplated by the legislature at the time, making it relevant in the context of evolving technology. |
| Marriage | Common law marriage, or non-ceremonial marriage, is a legal framework that may allow couples to be considered married without a formal registration. |
| Stability and Consistency | Common law promotes stability and consistency by basing decisions on previous case law rather than subjective viewpoints. |
| Efficiency | Judges in common law systems only need to follow precedent, which can make court proceedings shorter and more efficient. |
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What You'll Learn

Common law's influence on former British colonies
Common law, which originated in England after the Norman Conquest in 1066, has had a significant influence on the legal systems of many former British colonies. This influence can be traced back to the colonial era when British administrators brought English common and statutory law to their colonies. The British East India Company, for instance, introduced English law to its trading posts and factories in India. Similarly, British settlers brought common law to North America, South Africa, and Australia.
English common law was often adapted to local circumstances and integrated with indigenous legal traditions in the colonies. In North America, for example, the introduction of African slaves led to the implementation of laws regulating master-slave relations. In Australia, colonizers adopted the practice of terra nullius, or the idea that the land was unoccupied, disregarding native land claims. In some cases, indigenous cases were handled by local judges according to local customary law, resulting in a form of legal pluralism.
Many former British colonies continue to be influenced by common law today. For example, all but one of the provinces of Canada use a common law system for civil matters. Common law is also practiced in Hong Kong, India, New Zealand, and the United Kingdom. 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.
The influence of common law in former colonies can be seen in the reliance on judicial precedent and the style of reasoning inherited from the English legal system. Common law provides a stable and predictable body of law that can be adapted to new situations and interpretations. This adaptability has allowed common law to remain relevant and influential, particularly as technology and society continue to evolve.
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Common law in the US
Common law, also known as case law, is a body of unwritten laws based on legal precedents established by the courts. It draws from institutionalized opinions and interpretations from judicial authorities and public juries. Common law originated in England during the Middle Ages, in the King's Court (Curia Regis), a single royal court set up for most of the country at Westminster, near London. It was common to all the king's courts across England and drew from earlier Anglo-Saxon traditions.
The United States inherited and adopted English common law, which continued to exert influence over American common law for several decades after independence. The US common-law system evolved from a British tradition that spread to North America during the 17th and 18th centuries. The US federal courts relied on private publishers for legal reports until after the Civil War, only beginning to publish as a government function in 1874.
Today, the US operates under a dual system of both common and civil law. Common law is still very much in effect in the US, especially as the evolution of technology creates new situations that were not contemplated by the legislature. Common law allows for adaptability to unforeseen circumstances and leaves the legal code open for interpretation.
However, statutes are generally understood to supersede common law. They may codify existing common law, create new causes of action, or legislatively overrule the common law. Common law has practical applications in some areas of law, and some states continue to allow common-law marriage.
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Common law in the UK
Common law, also known as case law, is a body of unwritten laws based on legal precedents established by the courts. It is derived from its original appearance in medieval England, specifically in the King's Court (Curia Regis) in the centuries following the Norman Conquest in 1066. The common law, so named because it was common to all the king's courts across England, was largely created in the period after this conquest.
The United Kingdom, along with the US, operates under a dual system of both common and civil law. Common law is practised in several other countries, including Canada, Hong Kong, India, New Zealand, and Australia. The UK's legal system experienced integration into the system of European Union (EU) law in 1973, which affected the domestic law of its constituent states. However, the UK exited the EU in 2020.
Common law draws from institutionalised opinions and interpretations from judicial authorities and public juries. It is centred around a legal principle known as 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. This results in stability and consistency in the legal system, as everyone knows that the ultimate outcome will be based on previous caselaw rather than subjective viewpoints. It also allows for efficiency, as judges only need to follow precedent, and adaptability to unforeseen situations, as the code is left open to interpretation.
Common law is particularly useful in situations where there is no statutory law, in which case it forms the residual source of law. It is also the basis for common law marriage, where couples are considered married without having formally registered their union.
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Common law in Canada
Common law, or case law, is a system of law that originated in England after the Norman Conquest in 1066. It is a body of unwritten laws based on legal precedents established by the courts. Common law draws from institutionalized opinions and interpretations from judicial authorities and public juries. Common law is practiced in Canada, the US, the UK, Australia, Hong Kong, India, and New Zealand.
Canada operates under a dual system of both common and civil law. All but one of the provinces of Canada use a common law system for civil matters (the exception being Quebec, which uses a French-heritage civil law system). Common law in Canada is recognized in common-law relationships, which are defined differently by each province and the federal government. The federal government recognizes a common-law relationship after 12 months of consecutively living together or, in some circumstances, if the couple has children. Common-law couples are treated similarly to married couples by federal entities such as the Canadian Revenue Agency (CRA) for immigration, pension, and tax purposes. However, common-law couples do not have equal rights to traditional marriages, and they may face more challenges when obtaining the same property, inheritance, and support rights as married couples.
In the context of taxes, 'living common-law' in Canada refers to couples who have been living together for 12 continuous months or share a child by birth or adoption. Common-law partners may not automatically inherit their partner's estate, and it is important for them to create a will to ensure their wishes are carried out. In the province of Quebec, a common-law spouse is not entitled to anything from their deceased partner's estate unless they are named as a beneficiary in a will.
Common law also impacts other areas of law. For example, in the US, common law influences the decision-making process in unusual cases where existing statutes or written rules of law do not apply. The value of a common-law system is that it can be adapted to situations not contemplated by the legislature, and its ability to leave the legal code open for interpretation will become increasingly important as technology continues to evolve.
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Common law's adaptability to unforeseen situations
Common law is a body of unwritten laws based on legal precedents established by the courts. It draws from institutionalized opinions and interpretations from judicial authorities and public juries. Common law is adaptable to unforeseen situations because it places an emphasis on precedent while allowing some freedom for interpretation. This adaptability is particularly important as technology continues to evolve and play a larger role in our lives.
The value of a common-law system is that it can be adapted to situations that were not contemplated at the time by the legislature. Common law systems allow courts to address situations not originally predicted by lawmakers. This is because common law relies on detailed records of similar situations and statutes, as there is no official legal code that can be applied to a case at hand. The presiding judge determines which precedents apply to a particular case.
The example set by higher courts is binding on cases tried in lower courts. 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 still has practical applications in some areas of law. It is still very much in effect in the US and elsewhere today, including in most member states of the Commonwealth.
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Frequently asked questions
Common law is a body of unwritten laws based on legal precedents established by the courts.
Common law originated in England during the Middle Ages in the King’s Court (Curia Regis).
Yes, common law is still in use in the US, the UK, and many other countries.
Common law provides stability and consistency, as well as efficiency, as judges only need to follow precedent when making decisions. It also allows for adaptability to unforeseen situations.
Civil law is a comprehensive, codified set of legal statutes created by legislators, while common law is based on judicial decisions and precedents.





































