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.
Culture of England
English law is the legal system of England and Wales. Due to the British Empire, it has been exported across the world: it is the basis of common law jurisprudence. The 18th century English jurist, judge and politician Sir William Blackstone is best known for his seminal work, "Commentaries on the Laws of England", containing his formulation: "It is better that ten guilty persons escape than that one innocent suffer", a principle that government and the courts must err on the side of innocence, which has remained constant. Sir William Garrow ushered in the adversarial court system in common law. He coined the phrase "presumed innocent until proven guilty", insisting that defendants' accusers and their evidence be thoroughly tested in court.