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.
Civil law (legal system)
Civil law takes as its major inspiration classical Roman law ("c". AD 1–250), and in particular Justinian law (6th century AD), and further expanded and developed in the late Middle Ages under the influence of canon law. The Justinian Code's doctrines provided a sophisticated model for contracts, rules of procedure, family law, wills, and a strong monarchical constitutional system. Roman law was received differently in different countries. In some it went into force wholesale by legislative act, i.e., it became positive law, whereas in others it was diffused into society by increasingly influential legal experts and scholars.