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The equitable jurisdiction of a court of equity spanned much of English private law, particularly the law of property, contract, tort, and restitution, resulting in the development of equitable principles (e.g. good faith), interests (e.g. those under trust), remedies (e.g. injunctions), and maxims, that continue to this day.

Beginning in the Medieval ages, equitable rules were historically developed largely in cases before the courts of equity, which provided relief where the inflexible legal rules of the Court of Common Pleas and King's Bench were thought to be inequitable or unconscionable. In the late 19th-century, the Judicature Acts abolished the split system of courts in England, whilst retaining the laws of equity within English common law as a distinct but complementary set of rules.

The tradition of equity as a flexible system of adjudication can be traced to the writings of Aristotle (epieikeia) and Roman law (aequitas). Later, in some civil law systems, equity was integrated in the legal rules, but in common law systems it became an independent body of law. Today, equitable legal rules exists in both civil law and common law systems as well as in international law.

Terminology

The use of the terms "equity" and "common law" in legal discourse refers to a number of different concepts.

Political and philosophical concept

Equity, in a general sense, is often used to describe notions of fairness, justice, and equality. In his Nicomachean Ethics, Aristotle introduced the concept of epieikeia (equity), describing it as a necessary correction to the law when the law's "universality" makes its application unjust in a specific case. Courts often use "equity" in this sense and not specifically in relation to the law of equity.

In civilian jurisdictions

In ancient Roman law, magistrates, in particular the Praetors, would sometimes reference the concept of aequitas in performing their adjudicative and legislative functions. Over time, a body of law (ius honorarium) created by the Praetors emerged that supplemented the relatively inflexible civil law (ius civile). The development of this body of discretionary and relatively flexible rules, however, slowed over time, and by the time of Hadrian, had essentially been codified into a set of fixed ruled amendable only by the emperor.

In modern civil law jurisdictions, the concept of a split system of 'equitable' and 'legal' rules is not widely found or applied.

In common-law jurisdictions

Common law jurisdictions are those that trace its historical origins to medieval English law. Unlike many of the civilian jurisdictions in continental Europe, English law did not originate in the Roman law ius civile codes. Rather, much of English law was and is a result of the decisions of judges, and this judge-made law is described as the "common law" as it was common to all the English courts.

In common-law jurisdictions

Medieval Lord Chancellors, drawing upon the ancient distinction between the ius honorarium and ius civile in Roman law, began to assert a similar jurisdiction over legal matters where it was believed that the common law courts were too inflexible or could otherwise not deliver a just result. Over time, a separate body of rules began to emerge from the Lord Chancellor's Court of Chancery, which came to be known as rules of "equity".

The use of "equity" in relation to "common law" refers to the distinction between rules that originated in the "common law" (or just "law") from those in "equity". Modern equity includes areas of law such as injunctive relief, trusts, fiduciary law, estoppel, relief against penalties and forfeiture, the doctrines of contribution, subrogation and marshalling, and the set-off.

As equitable interests

The term "equity" may also be used to refer to an equitable interest. The High Court of Australia in Latec Investments Ltd v Hotel Terrigal Pty Ltd identified three kinds of equities: equitable interests, mere equities and personal equities. A mere equity, for example, may arise when one party has been unjustly disadvantaged by the unconscionable behaviour of another. Importantly, however, a 'mere equity' will not prevail over an actual bona fide equitable interest – such as an equitable charge. In English law, 'mere equities' are codified in statute.

Financial concept

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