
The world's legal systems are broadly divided into common law systems and civil law systems. Common law, or judge-made law, is a body of unwritten laws based on past judicial decisions and legal precedents. It originated in England during the Middle Ages and is still used in several countries today, including the US, Canada, India, and Australia. The US, for example, has a dual system of both common and civil law. Common law is often associated with the concept of common-law marriage, which grants similar rights to couples who are not officially married but meet certain requirements. While common law has its advantages, it has also been criticized for perpetuating outdated or biased decisions that can marginalize certain groups.
| Characteristics | Values |
|---|---|
| Origin | England during the Middle Ages |
| Basis | Local customs and precedent |
| Current use | United States, United Kingdom, Canada, Australia, India, and other former British colonies |
| Type of law | Unwritten law, judge-made law, case law, judicial precedent |
| Flexibility | Adapts to changing societal conditions |
| Dispute resolution | Adversarial system |
| Trial | Jury trials |
| Doctrine of supremacy of the law | Acts of government agencies are subject to scrutiny in ordinary legal proceedings |
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What You'll Learn

Common law marriage
Common-law marriage, also known as non-ceremonial marriage, informal marriage, or marriage by habit and repute, is a marriage that occurs when two people capable of entering into a marriage agree to consider themselves married and subsequently cohabit, without undergoing a statutorily defined process. Common-law marriage does not require a marriage license or a marriage ceremony. Instead, it is based on the couple's agreement to be married, their cohabitation, and their representation of themselves as a married couple to the world.
The concept of common-law marriage recognises similar rights to those of couples with a marriage license, provided certain conditions are met. It grants couples who are not officially married through a formal process the same rights as those who are. Common-law marriage places an emphasis on precedent while allowing some freedom for interpretation, making it adaptable to situations not contemplated by the legislature.
While the term "common-law marriage" is often used to describe various types of couple relationships, such as cohabitation or other legally formalized relations, it is important to note that these relationships differ from the original meaning of common-law marriage as they may not be legally recognised as marriages. The legal recognition of a common-law marriage depends on the jurisdiction, with some states or countries respecting the validity of such marriages if lawfully entered into in another state or country.
The requirements for a common-law marriage vary, but generally include factors such as cohabitation for a period of time, both partners' intent to be married, their legal right or capacity to marry, and their representation of themselves as a married couple to the community. There is no statutory requirement for the length of time a couple needs to live together, and the court considers each case individually. Common-law marriage has a long history, dating back to medieval England, and continues to be recognised in some jurisdictions today.
In summary, common-law marriage is a legal concept that recognises a couple as married based on their mutual agreement, cohabitation, and representation as a married couple, without the need for a formal marriage license or ceremony. It grants similar rights to those of officially married couples and is adaptable to changing societal needs. However, it is important to understand the specific requirements and legal recognition of common-law marriage in different jurisdictions.
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Common law vs civil law
Common law and civil law are the two main types of legal systems in the world, with most countries adopting features from one or the other into their own legal systems. Common law is a body of unwritten laws based on legal precedents established by the courts. Civil law, on the other hand, is a comprehensive, codified set of legal statutes created by legislators.
In common law countries like the US and the UK, judges can make laws in certain areas. Common law draws from institutionalized opinions and interpretations from judicial authorities and public juries. Similar to civil law, 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 elements of common law differing between districts. A common law marriage, for example, is a legal framework that may allow couples to be considered married without a ceremony.
In civil law countries like Germany and France, the legislatures pass much more detailed laws, and they don’t rely as much on the opinions of judges. A civil system clearly defines the cases that can be brought to court, the procedures for handling claims, and the punishment for an offense. Judicial authorities use the conditions in the applicable civil code to evaluate the facts of each case and make legislative decisions. While civil law is regularly updated, the goal of standardized codes is to create order and reduce biased systems in which laws are applied differently from case to case.
A common law system is less prescriptive than a civil law system. There are few provisions implied into a contract under a common law system, so it is important to set out all the terms governing the relationship between the parties to a contract in the contract itself. In civil law systems, there are a number of provisions implied into a contract, and less importance is placed on setting out all the terms in the contract itself as inadequacies or ambiguities can be resolved by operation of law.
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Common law in the US
Common law, also known as judicial precedent, judge-made law, or case law, is a body of law based on previous legal rulings and decisions. It is distinct from civil law, which relies on codes and statutes. The United States, along with several other countries, including Canada, India, and Australia, follows a common law system for resolving legal disputes.
The US common law system can trace its roots back to medieval England, and English common law served as the basis for early American common law rules. However, no US state has a pure common law system due to the presence of codified statutes that courts must consider. Despite this, the principle of stare decisis, or the idea that courts should follow previous rulings, remains a constant in US common law. This means that even when interpreting a statute, prior court decisions interpreting that statute are considered precedent and are binding.
At the federal level, there is a limited body of federal common law, which refers to rules created and applied by federal courts in the absence of a controlling federal statute. The Supreme Court has clarified that federal courts exercising diversity jurisdiction must follow the same substantive law as the courts of the states in which they are located, indicating that there is no "general federal common law".
While common law provides flexibility and adaptability to evolving situations, it has also been criticised for perpetuating outdated or biased decisions, making it challenging for marginalised groups to secure favourable rulings until societal changes prompt a re-evaluation of the precedent.
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Common law in the UK
Common law is a term with historical origins in the legal system of England. It originated in the early 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 called "common" because it applied equally across the whole country. Common law is a body of unwritten laws based on legal precedents and may guide court rulings when the outcome is undetermined based on written rules of law. It is deeply rooted in the principle of 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. Common law is made by sitting judges who apply both statutory law and established principles derived from the reasoning in earlier decisions.
English criminal law derives its main principles from common law. The main elements of a crime are the actus reus (doing something which is criminally prohibited) and the mens rea (having the requisite criminal state of mind, usually intention or recklessness). A prosecutor must show that a person has caused the offensive conduct or that the culprit had some pre-existing duty to take steps to avoid a criminal consequence. Common law includes both substantive rules, such as the offence of murder, and procedural ones, such as court procedure rules derived from the inherent jurisdiction of the court.
The United Kingdom comprises three major legal systems: those of England and Wales, Scotland, and Northern Ireland. The common-law system in England has directly influenced that of Wales (since 1536) and Ireland, but only partially influenced the distinct legal system in Scotland. The UK's primary legislation may take the form of Acts of the Senedd, Orders in Council, or secondary ("delegated") legislation.
In the UK, the most authoritative law is statutory legislation, which comprises Acts of Parliament, regulations, and by-laws. In the absence of any statutory law, common law forms the residual source of law. The common law of England was largely created in the period after the Norman Conquest of 1066. It has had a strong influence on the law of shipping and maritime trade, with many international conventions incorporating principles derived from English common law.
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Common law in other countries
Common law, also known as case law, is a legal system in which previous court decisions are treated as precedents that guide future decisions. Common law is primarily used in countries that were once British colonies, as well as in some countries that were not formerly colonised, such as Ghana. Approximately 40 countries and territories use common law, and about 60 more use it as part of a mixed legal system.
Common law countries include Australia (federally and in each state and territory), the United States (federally and in each state and territory, except Louisiana), and many Caribbean jurisdictions, such as Antigua and Barbuda, Barbados, the Bahamas, Dominica, Grenada, Jamaica, St Vincent and the Grenadines, Saint Kitts and Nevis, and Trinidad and Tobago.
Other countries that use common law include Ghana, where it is enshrined in the 1992 Constitution, and Israel, whose legal system is based on English common law, as well as other legal traditions, including religious law.
Common law is one of the two main legal systems used today, alongside civil law, which originated in mainland Europe and is the most widespread by landmass and population. Civil law systems rely primarily on codes and statutes, and centre around a comprehensive code of statutes that outlines procedures and punishments. While civil law systems have clear rules for judges to follow, common law systems offer more flexibility and adaptability to the unforeseen.
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Frequently asked questions
Common law is a body of unwritten laws based on legal precedents and previous court decisions, also known as judicial precedent, judge-made law, or case law.
Common law is practised in several countries around the world, including the US, Canada, India, Australia, and the UK.
Common-law marriage is a form of marriage that is legally recognised in some states and countries. It grants similar rights to those with a marriage license to couples who are not officially married. Common-law marriages are typically based on a set of requirements, including cohabitation, the legal right to marry, and the intention to be married.




































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