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.
Twelve Tables
The influence of the Twelve Tables is still evident in the modern day. For example, the Twelve Tables are tied into the notion of Jus Commune, also known as "common law." Some countries including South Africa and San Marino still base their current legal system on aspects of common law. In addition, law school students throughout the world are still required to study the Twelve Tables as well as other facets of Roman Law in order to better understand the current legal system in place.