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.
Zephaniah Swift
"Zephaniah Swift was a pioneer in development of an American common law distinct from England." During the colonial era, it was common to follow precedents from English courts. "In 1795, Swift wrote the first text on American law, called 'A System of Law,' which stated what in his opinion the common law of Connecticut was, based on what Connecticut judges were actually doing. It was a radical departure from English precedents, and was an appropriate departure too if the 'Revolution' was to have practical meaning."