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. Prior to the Norman Conquest, much of England's legal business took place in the local folk courts of its various shires and hundreds. A variety of other individual courts also existed across the land: urban boroughs and merchant fairs held their own courts, as did the universities of Oxford and Cambridge, and large landholders also held their own manorial and seigniorial courts as needed. Additionally, the Catholic Church operated its own court system that adjudicated issues of canon law.
Oliver Wendell Holmes Jr.
The common law evolves because civilized society evolves, and judges share the common preconceptions of the governing class. These views endeared Holmes to the later advocates of legal realism, and made him one of the early founders of law and economics jurisprudence. "The Common Law" is the only major scholarly work written by a practicing attorney. Holmes famously contrasted his own scholarship with the abstract doctrines of Christopher Columbus Langdell, dean of Harvard Law School, who viewed the common law as a self-enclosed set of doctrines. Holmes viewed Langdell's work as akin to the German philosophic idealism he had for so long resisted, opposing it with his own scientific materialism.