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.
Justice of the Common Pleas
Justice of the Common Pleas was a puisne judicial position within the Court of Common Pleas of England and Wales, under the Chief Justice. The Common Pleas was the primary court of common law within England and Wales, dealing with "common" pleas (civil matters between subject and subject). It was created out of the common law jurisdiction of the Exchequer of Pleas, with splits forming during the 1190s and the division becoming formal by the beginning of the 13th century. The court became a key part of the Westminster courts, along with the Exchequer of Pleas (qualified to hear cases involving revenue owed to the King) and the Court of King's Bench (authorised to hear cases involving the King), but with the Writ of Quominus and the Statute of Westminster, both tried to extend their jurisdiction into the realm of common pleas. As a result, the courts jockeyed for power. In 1828 Henry Brougham, a Member of Parliament, complained in Parliament that as long as there were three courts unevenness was inevitable, saying that "It is not in the power of the courts, even if all were monopolies and other restrictions done away, to distribute business equally, as long as suitors are left free to choose their own tribunal", and that there would always be a favourite court, which would therefore attract the best lawyers and judges and entrench its position. The outcome was the Supreme Court of Judicature Act 1873, under which all the central courts were made part of a single Supreme Court of Judicature. Eventually the government created a High Court of Justice under Lord Coleridge by an Order in Council of 16 December 1880. At this point, the Common Pleas formally ceased to exist.