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.
Jus commune
The "", in its historical meaning, is commonly thought of as a combination of canon law and Roman law which formed the basis of a common system of legal thought in Western Europe from the rediscovery and reception of Justinian's Digest in the 12th and 13th centuries. In addition to this definition, the term also possibly had a narrower meaning depending upon the context in which it was used. Some scholars believe that the term, when used in the context of the ecclesiastical courts of England in the fourteenth and fifteenth century, also "meant the law that is common to the universal church, as opposed to the constitutions or special customs or privileges of any provincial church."