Judge in the context of Law library

A jury is a sworn body of people (jurors) convened to hear evidence, make findings of fact, and render an impartial verdict officially submitted to them by a court, or to set a penalty or judgment. Most trial juries are "petit juries", and consist of up to 15 people. A larger jury known as a grand jury has been used to investigate potential crimes and render indictments against suspects, and consists of between 16 and 23 jurors.

The jury system developed in England during the Middle Ages and is a hallmark of the English common law system. Juries are commonly used in countries whose legal systems derive from the British Empire, such as the United Kingdom, the United States, Canada, Australia, and Ireland. They are not used in most other countries, whose legal systems are based upon European civil law or Islamic sharia law, although their use has been spreading. Instead, typically guilt is determined by a single person, usually a professional judge. Civil law systems that do not use juries may use lay judges instead.

Charles Louis de Secondat, baron de La Brède et de Montesquieu (18 January 1689 – 10 February 1755), generally referred to as simply Montesquieu, was a French judge, intellectual, historian, and political philosopher.

He is the principal source of the theory of separation of powers, which is implemented in many constitutions throughout the world. He is also known for doing more than any other author to secure the place of the word despotism in the political lexicon. His anonymously published The Spirit of Law (De l'esprit des lois, 1748) first translated into English (Nugent) in a 1750 edition was received well in both Great Britain and the American colonies, and influenced the Founding Fathers of the United States in drafting the U.S. Constitution.

The Government of Japan is the central government of Japan. It consists of legislative, executive and judiciary branches and functions under the framework established by the Constitution of Japan. Japan is a unitary state, containing forty-seven administrative divisions, with the emperor as its head of state. His role is ceremonial and he has no powers related to the Government. Instead, it is the Cabinet, comprising the prime minister and the ministers of state, that directs and controls the government and the civil service. The Cabinet has the executive power and is formed by the prime minister, who is the head of government. The Prime Minister is nominated by the National Diet and appointed to office by the Emperor. The current cabinet is the Takaichi Cabinet, which is led by prime minister Sanae Takaichi, who assumed office on 21 October 2025. The country has had a Liberal Democratic minority government since 2025.

The National Diet is the legislature, the organ of the Legislative branch. The Diet is bicameral, consisting of two houses with the House of Councilors being the upper house, and the House of Representatives being the lower house. The members of both houses of the Diet are directly elected by the people, who are the source of sovereignty. The Diet is defined as the supreme organ of sovereignty in the Constitution. The Supreme Court and other lower courts make up the Judicial branch and have all the judicial powers in the state. The Supreme Court has ultimate judicial authority to interpret the constitution and the power of judicial review. The judicial branch is independent from the executive and the legislative branches. Judges are nominated or appointed by the Cabinet and never removed by the executive or the legislature except during impeachment.

In law, a verdict is the formal finding of fact made by a jury on matters or questions submitted to the jury by a judge. In a bench trial, the judge's decision near the end of the trial is simply referred to as a finding. In England and Wales, a coroner's findings used to be called verdicts but are, since 2009, called conclusions (see Coroner § Inquest conclusions (previously called verdicts)).

A court is an institution, often a government entity, with the authority to adjudicate legal disputes between parties and administer justice in civil, criminal, and administrative matters in accordance with the rule of law.

Courts generally consist of judges or other judicial officers, and are usually established and dissolved through legislation enacted by a legislature. Courts may also be established by constitution or an equivalent constituting instrument.

In common law, a petit jury (or trial jury; pronounced /ˈpɛtət/ or /pəˈtiːt/, depending on the jurisdiction) hears the evidence in a trial as presented by both the plaintiff (petitioner) and the defendant (respondent). After hearing the evidence and often jury instructions from the judge, the group retires for deliberation, to consider a verdict. The majority required for a verdict varies. In some cases it must be unanimous, while in other jurisdictions it may be a majority or supermajority. A jury that is unable to come to a verdict is referred to as a hung jury. The size of the jury varies; in criminal cases involving serious felonies there are usually 12 jurors, although Scotland uses 15. A number of countries that are not in the English common law tradition have quasi-juries on which lay judges or jurors and professional judges deliberate together regarding criminal cases. However, the common law trial jury is the most common type of jury system.

In civil cases many trials require fewer than twelve jurors. Juries are almost never used in civil cases outside the United States and Canada. Other states with a common law tradition sometimes use them in defamation cases, in cases involving a governmental eminent domain power, and in cases involving alleged wrongful conviction. Civil law countries generally do not use civil juries. Civil juries are available in the United States and Canada in almost all cases where the only remedy sought is money damages.

A lay judge, sometimes called a lay assessor, is a person assisting a judge in a trial. Lay judges are used in some civil law jurisdictions. Lay judges are appointed volunteers and often require some legal instruction. However, they are not permanent officers. They attend proceedings about once a month, and often receive only nominal or "costs covered" pay. Lay judges are usually used when the country does not have juries. Lay judges may be randomly selected for a single trial (as jurors are), or politically appointed. In the latter case they may usually not be rejected by the prosecution, the defense, or the permanent judges. Lay judges are similar to magistrates of England and Wales, but magistrates sit about twice as often.

Court dress comprises the style of clothes and other attire prescribed for members of courts of law. Depending on the country and jurisdiction's traditions, members of the court (judges, magistrates, and so on) may wear formal robes, gowns, collars, or wigs. Within a certain country and court setting, there may be many times when the full formal dress is not used. Examples in the UK include many courts and tribunals including the Supreme Court of the United Kingdom, and sometimes trials involving children.

Judicial independence is the concept that the judiciary should be independent from the other branches of government. That is, courts should not be subject to improper influence from the other branches of government or from private or partisan interests. Judicial independence is important for the idea of separation of powers.

Different countries deal with the idea of judicial independence through different means of judicial selection, that is, choosing judges. One method seen as promoting judicial independence is by granting life tenure or long tenure for judges, as it would ideally free them to decide cases and make rulings according to the rule of law and judicial discretion, even if those decisions are politically unpopular or opposed by powerful interests. This concept can be traced back to 18th-century England.

A decree is a legal proclamation, usually issued by a head of state, judge, royal figure, or other relevant authorities, according to certain procedures. These procedures are usually defined by the constitution, Legislative laws, or customary laws of a government.

The Roman magistrates (Latin: magistratus) were elected officials in ancient Rome. During the period of the Roman Kingdom, the King of Rome was the principal executive magistrate. His power, in practice, was absolute. He was the chief priest, lawgiver, judge, and the sole commander of the army. When the king died, his power reverted to the Roman Senate, which then chose an Interrex to facilitate the election of a new king.

During the transition from the Roman Kingdom to Roman Republic, the constitutional balance of power shifted from the executive (the Roman king) to the Roman Senate. When the Roman Republic was founded in 509 BC, the powers that had been held by the king were transferred to the Roman consuls, of which two were to be elected each year. Magistrates of the republic were elected by the people of Rome, and were each vested with a degree of power called "major powers" (maior potestas). Dictators had more "major powers" than any other magistrate, and after the dictator was the censor, and then the consul, and then the praetor, and then the curule aedile, and then the quaestor. Any magistrate could obstruct ("veto") an action that was being taken by a magistrate with an equal or lower degree of magisterial powers. By definition, plebeian tribunes and plebeian aediles were technically not magistrates since they were elected only by the plebeians, and plebeian tribunes could veto the actions of any ordinary magistrate.

A life tenure or service during good behaviour is a term of office that lasts for the office holder's lifetime, unless the office holder decides personally to resign or is removed from office because of misbehaving in office or due to extraordinary circumstances.

Some judges and members of upper chambers (e.g., senators for life) have life tenure. The primary goal of life tenure is to insulate the office holder from external pressures. Certain heads of state, such as monarchs and presidents for life, are also given life tenure. United States federal judges have life tenure once appointed by the president and confirmed by the Senate.

In law, a trier of fact or finder of fact is a person or group who determines disputed issues of fact in a legal proceeding (usually a trial) and how relevant they are to deciding its outcome. To determine a fact is to decide, from the evidence presented, whether something existed or some event occurred.

The factfinder differs by the type of proceeding. In a jury trial, it is the jury; in a non-jury trial, the judge is both the factfinder and the trier of law. In administrative proceedings, the factfinder may be a hearing officer or a hearing body.

A bench trial is a trial by judge, as opposed to a jury. The term applies most appropriately to any administrative hearing in relation to a summary offense to distinguish the type of trial. Many legal systems (Roman, Islamic) use bench trials for most or all cases or for certain types of cases.

As a jury renders a verdict, in a bench trial, a judge does the same by making a finding.

Legal proceeding is an activity that seeks to invoke the power of a tribunal in order to enforce a law. Although the term may be defined more broadly or more narrowly as circumstances require, it has been noted that "[t]he term legal proceedings includes proceedings brought by or at the instigation of a public authority, and an appeal against the decision of a court or tribunal". Legal proceedings are generally characterized by an orderly process in which participants or their representatives are able to present evidence in support of their claims, and to argue in favor of particular interpretations of the law, after which a judge, jury, or other trier of fact makes a determination of the factual and legal issues.

• Activities needed to have a court deem legal process to have been provided, such as through service of process.
• Conduct of a trial, whether a lawsuit or civil trial, or a criminal trial.
• Issuance and enforcement of court orders, including those imposing foreclosure or receivership.
• Hearings, particularly administrative hearings.
• Arbitration.

In the United States, Congressional hearings are not generally considered legal proceedings, as they are generally not directed towards the imposition of a penalty against a specific individual for a specific wrong. However, impeachment proceedings are generally conducted as legal proceedings, although experts dispute the question of whether they are primarily legal proceedings, or are merely political proceedings dressed in legal formalities and language. Richard Posner, for example, has asserted that it was "the intent of the framers of the Constitution that an impeachment proceeding be primarily a legal proceeding, akin to a criminal prosecution, rather than a political one".

A judicial officer is a person with the responsibilities and powers to facilitate, arbitrate, preside over, and make decisions and directions with regard to the application of the law.

Judicial officers are typically categorized as judges, magistrates, puisne judicial officers such as justices of the peace or officers of courts of limited jurisdiction; and notaries public and commissioners of oaths. The powers of judicial officers vary and are usually limited to a certain jurisdiction.

In law, a trial is a coming together of parties to a dispute, to present information (in the form of evidence) in a tribunal, a formal setting with the authority to adjudicate claims or disputes. One form of tribunal is a court. The tribunal, which may occur before a judge, jury, or other designated trier of fact, aims to achieve a resolution to their dispute.

A court order is an official proclamation by a judge (or panel of judges) that defines the legal relationships between the parties to a hearing, a trial, an appeal or other court proceedings. Such ruling requires or authorizes the carrying out of certain steps by one or more parties to a case. A court order must be signed by a judge; some jurisdictions may also require it to be notarized. A court order governs each case throughout its entirety. If an individual violates the court order, the judge may hold that person in contempt.

A judicial opinion is a form of legal opinion written by a judge or a judicial panel in the course of resolving a legal dispute, providing the decision reached to resolve the dispute, and usually indicating the facts which led to the dispute and an analysis of the law used to arrive at the decision.