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In presidential systems, the executive acts as both head of state and head of government, and has power to appoint an unelected cabinet. Under a presidential system, the executive branch is separate from the legislature to which it is not accountable. Definitions of law often raise the question of the extent to which law incorporates morality. John Austin’s utilitarian answer was that law is “commands, backed by threat of sanctions, from a sovereign, to whom people have a habit of obedience”. Natural lawyers on the other side, such as Jean-Jacques Rousseau, argue that law reflects essentially moral and unchangeable laws of nature. The concept of “natural law” emerged in ancient Greek philosophy concurrently and in connection with the notion of justice, and re-entered the mainstream of Western culture through the writings of Thomas Aquinas, notably his Treatise on Law.

• This powerful and tight-knit judiciary gave rise to a systematised process of developing common law.
• In the EU, sovereign nations have gathered their authority in a system of courts and the European Parliament.
• Our impact Our researchers are driving law reform and policy, and benefiting communities with their thought leadership and advocacy.
• Most countries have systems of appeal courts, with an apex court as the ultimate judicial authority.
• The sources that jurisdictions adopt as authoritatively binding are the defining features of any legal system.

John Locke, in his Two Treatises of Government, and Baron de Montesquieu in The Spirit of the Laws, advocated for a separation of powers between the political, legislature and executive bodies. Their principle was that no person should be able to usurp all powers of the state, in contrast to the absolutist theory of Thomas Hobbes’ Leviathan. Sun Yat-sen’s Five Power Constitution for the Republic of China took the separation of powers further by having two additional branches of government—a Control Yuan for auditing oversight and an Examination Yuan to manage the employment of public officials. Civil law jurisdictions treat contracts differently in a number of respects, with a more interventionist role for the state in both the formation and enforcement of contracts. In France, an ordinary contract is said to form simply on the basis of a “meeting of the minds” or a “concurrence of wills”.

Immigration law and nationality law concern the rights of foreigners to live and work in a nation-state that is not their own and to acquire or lose citizenship. Both also involve the right of asylum and the problem of stateless individuals. The G20 meetings are composed of representatives of each country’s executive branch.

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Canon law is only in use by members of the Catholic Church, the Eastern Orthodox Church and the Anglican Communion. Common law originated from England and has been inherited by almost every country once tied to the British Empire (except Malta, Scotland, the U.S. state of Louisiana, and the Canadian province of Quebec). In medieval England, the Norman conquest the law varied shire-to-shire, based on disparate tribal customs. The concept of a “common law” developed during the reign of Henry II during the late 12th century, when Henry appointed judges that had authority to create an institutionalised and unified system of law “common” to the country. The next major step in the evolution of the common law came when King John was forced by his barons to sign a document limiting his authority to pass laws.

Jurisprudence, the field of knowledge which encompasses these rules.She went to university to study law. Unlike criminal matters and the policing of trades and markets, religious courts had no executive powers in matters of family law. Law and order is the condition of a society in which laws are obeyed, and social life and business go on in an organized way. As a law student, you will be expected to read many articles, journals, magazines, or textbooks. Civil law jurisdictions recognise custom as “the other source of law”; hence, scholars tend to divide the civil law into the broad categories of “written law” or legislation, and “unwritten law” (ius non-scriptum) or custom. Yet they tend to dismiss custom as being of slight importance compared to legislation (Georgiadis, General Principles of Civil Law, 19; Washofsky, Taking Precedent Seriously, 7).

Constitutional Law

In civil law the sources recognised as authoritative are, primarily, legislation—especially codifications in constitutions or statutes passed by government—and custom. Codifications date back millennia, with one early example being the Babylonian Codex Hammurabi. Modern civil law systems essentially derive from legal codes issued by Byzantine Emperor Justinian I in the 6th century, which were rediscovered by 11th century Italy. Roman law in the days of the Roman Republic and Empire was heavily procedural, and lacked a professional legal class. Decisions were not published in any systematic way, so any case law that developed was disguised and almost unrecognised. Each case was to be decided afresh from the laws of the State, which mirrors the unimportance of judges’ decisions for future cases in civil law systems today.

This is to insure against the risk of economic crises, such as the Wall Street Crash of 1929. Civil procedure and criminal procedure concern the rules that courts must follow as a trial and appeals proceed. Labour law is the study of a tripartite industrial relationship between worker, employer and trade union.