Common law
The common lawso named because it was "common" to all the king's courts across Englandoriginated in the practices of the courts of the English kings in the centuries following the Norman Conquest in 1066. The British Empire spread the English legal system to its historical colonies, many of which retain the common law system today. These "common law systems" are legal systems that give great precedential weight to common law, and to the style of reasoning inherited from the English legal system.
Oliver Wendell Holmes Jr.
"The Common Law" has been continuously in print since 1881, and remains an important contribution to jurisprudence. The book also remains controversial, for Holmes begins by rejecting various kinds of formalism in law. In his earlier writings he had expressly denied the utilitarian view that law was a set of commands of the sovereign, rules of conduct that became legal duties. He rejected as well the views of the German idealist philosophers, whose views were then widely held, and the philosophy taught at Harvard, that the opinions of judges could be harmonized in a purely logical system. In the opening paragraphs of the book, he famously summarized his own view of the history of the common law: