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.
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.