Civil law or Romano-Germanic law or Continental law is the predominant system of law in the world. Civil law as a legal system is often compared with common law. The main difference that is usually drawn between the two systems is that common law draws abstract rules from specific cases, whereas civil law starts with abstract rules, which judges must then apply to the various cases before them.
Civil law has its roots in Roman law, Canon law (Christian, especially Catholic law) and the Enlightenment, alongside influences from other religious laws such as Islamic law. The legal systems in many civil law countries are based around one or several codes of law, which set out the main principles that guide the law. The most famous example is perhaps the French Civil Code, although the German Bürgerliches Gesetzbuch (or BGB) and the Swiss Civil Code are also landmark events in the history of civil law. The civil law systems of Scotland and South Africa are uncodified, and the civil law systems of Scandinavian countries remain largely uncodified.
The so-called Socialist law is often considered to be a particular case of the Romano-Germanic civil law, though in the past it was sometimes classified as a separate legal system.
The acceptance of Roman law had different characteristics in different countries. In some of them its effect resulted from legislative act, i.e. it became positive law, whereas in other ones it became accepted by way of its processing by legal theorists.
Consequently, Roman law did not completely dominate in Europe. Roman law was a secondary source that was applied only as long as local customs and local laws lacked a pertinent provision on a particular matter. However, local rules too were interpreted primarily according to Roman law (it being a common European legal tradition of sorts), resulting in its influencing the main source of law also.
A second characteristic, beyond Roman law foundations, is the extended codification of the adopted Roman law, i.e. its inclusion into civil codes. The concept of codification dates back to the Code of Hammurabi in ancient Babylon.
The concept of codification was further developed during the 17th and 18th century, as an expression of both Natural Law and the ideas of the Enlightenment. The political ideal of that era was expressed by the concepts of democracy, protection of property and the rule of law. That ideal required the creation of certainty of law, through the recording of law and through its uniformity. So, the aforementioned mix of Roman law and customary and local law ceased to exist, and the road opened for law codification, which could contribute to the aims of the above mentioned political ideal.
Another reason that contributed to codification was that the notion of the nation state, which was born during the 19th century, required the recording of the law that would be applicable to that state.
Certainly, there was also reaction to the aim of law codification. The proponents of codification regarded it as conducive to certainty, unity and systematic recording of the law; whereas its opponents claimed that codification would result in the ossification of the law.
At the end, despite whatever resistance to codification, the codification of European private laws moved forward. The French Napoleonic Code (code civil) of 1804, the German civil code (Bürgerliches Gesetzbuch) of 1900 and the Swiss codes were the most influential national civil codes.
Because Germany was a rising power in the late 19th century and its legal system was well organized, when many Asian nations were developing, the German Civil Code became the basis for the legal systems of Japan and South Korea. In China, the German Civil Code was introduced in the later years of the Qing Dynasty and formed the basis of the law of the Republic of China, which remains in force in Taiwan.
Some authors consider civil law to have served as the foundation for socialist law used in Communist countries, which in this view would basically be civil law with the addition of Marxist–Leninist ideas.
Several legal institutions in civil law were also adapted from similar institutions in Islamic law and jurisprudence during the Middle Ages. For example, the Islamic Hawala institution is the basis of the Avallo in Italian civil law and the Aval in French civil law.
The original difference is that, historically, common law was law developed by custom, beginning before there were any written laws and continuing to be applied by courts after there were written laws, too, whereas civil law developed out of the Roman law of Justinian's Corpus Juris Civilis (Body of Civil Law).
In later times, civil law became codified as droit coutumier or customary law that were local compilations of legal principles recognized as normative. Sparked by the age of enlightenment, attempts to codify private law began during the second half of the 18th century (see civil code), but civil codes with a lasting influence were promulgated only after the French Revolution, in jurisdictions such as France (with its Napoleonic Code), Austria (see ABGB), Quebec (see Civil Code of Quebec), Italy (Codice Civile), Portugal (Código Civil), Spain (Código Civil), the Netherlands (see Burgerlijk Wetboek), and Germany (see Bürgerliches Gesetzbuch). However, codification is by no means a defining characteristic of a civil law system, as e.g. the civil law systems of Scandinavian countries remain largely uncodified , whereas common law jurisdictions have frequently codified parts of their laws, e.g. in the U.S. Uniform Commercial Code. There are also mixed systems, such as the laws of Scotland, Louisiana, Quebec, the Philippines, Namibia and South Africa.
Thus, the difference between civil law and common law lies not just in the mere fact of codification, but in the methodological approach to codes and statutes. In civil law countries, legislation is seen as the primary source of law. By default, courts thus base their judgments on the provisions of codes and statutes, from which solutions in particular cases are to be derived. Courts thus have to reason extensively on the basis of general rules and principles of the code, often drawing analogies from statutory provisions to fill lacunae and to achieve coherence. By contrast, in the common law system, cases are the primary source of law, while statutes are only seen as incursions into the common law and thus interpreted narrowly.
The underlying principle of separation of powers is seen somewhat differently in civil law and common law countries. In some common law countries, especially the United States, judges are seen as balancing the power of the other branches of government. By contrast, the original idea of separation of powers in France was to assign different roles to legislation and to judges, with the latter only applying the law (the judge as la bouche de la loi; 'the mouth of the law'). This translates into the fact that many civil law jurisdictions reject the formalistic notion of binding precedent (although paying due consideration to settled case-law), or restrict the power to set precedents to a competent Supreme Court.
There are other notable differences between the legal methodologies of various civil law countries. For example, it is often said that common law opinions are much longer and contain elaborate reasoning, whereas legal opinions in civil law countries are usually very short and formal in nature. This is in principle true in France, where judges cite only legislation, but not prior case law. (However, this does not mean that judges do not consider it when drafting opinions.) By contrast, court opinions in German-speaking countries can be as long as English ones, and normally discuss prior cases and academic writing extensively.
There are, however, certain sociological differences. In some Civil law countries judges are trained and promoted separately from attorneys, whereas common law judges are usually selected from accomplished and reputable attorneys. In the Scandinavian countries judges are attorneys who have applied for the position, whereas France has a specialized graduate school for judges.
With respect to criminal procedure, certain civil law systems are based upon a variant of the inquisitorial system rather than the adversarial system. This kind of judicial organization is sometimes criticized as lacking a presumption of innocence. Most European countries, however, are parties to the European Convention on Human Rights and Article 6 guarantees "the right to a fair trial" and the presumption of innocence. The Convention is ratified by all the members and as such part of their national legislation. Some Civil law nations also have legislation that predates the Convention and secures the defendant the presumption of innocence. Amongst them Norway where the presumption is guaranteed by uncodified customary law and validated theory recognized by the Supreme Court in plenary (effectively forming a precedent).
While the presumption of innocence is present, what distinguishes the more inquisitorial system is the frequent lack of a jury of peers, which is guaranteed in many common law jurisdictions. Inquisitorial systems tend to have something akin to a "bench" trial made up of a single judge or a tribunal. Some Scandinavian nations have a tribunal that consists of one civilian and two trained legal professionals. One result of the inquisitorial system's lack of jury trial is a significant difference in the rules of trial evidence. Common law rules of evidence are founded on a concern that juries will misuse, or give inappropriate weight to unreliable evidence. In inquisitorial systems the rules of evidence are sometimes less complicated because legal professionals are considered capable of identifying reliable evidence. Most noteworthy of these is the lack of a hearsay rule.
Portugal, Brazil and Italy have evolved from French to German influence, as their 19th century civil codes were close to the Napoleonic Code and their 20th century civil codes are much closer to the German Bürgerliches Gesetzbuch. Legal culture and law schools have also come near to the German system. The other law in these countries is often said to be of a hybrid nature.
The Dutch law, or at least the Dutch civil code (the Burgerlijk Wetboek) cannot be easily placed in one of the mentioned groups, and it has itself influenced the modern private law of other countries. The present Russian civil code is in part a translation of the Dutch one.
Law in the state of Louisiana is based in part on civil law. Louisiana is the only U.S. state partially based on French and Spanish codes and ultimately Roman law, as opposed to English common law. In Louisiana, private law is based on the Louisiana Civil Code.