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.
Civil law (legal system)
Consequently, neither of the two waves of Roman influence completely dominated in Europe. Roman law was a secondary source that was applied only when local customs and laws were found lacking on a certain subject. However, after a time, even local law came to be interpreted and evaluated primarily on the basis of Roman law, since it was a common European legal tradition of sorts, and thereby in turn influenced the main source of law. Eventually, the work of civilian glossators and commentators led to the development of a common body of law and writing about law, a common legal language, and a common method of teaching and scholarship, all termed the "jus commune", or law common to Europe, which consolidated canon law and Roman law, and to some extent, feudal law.