Commentaries on the Laws of England

The Commentaries on the Laws of England are an influential 18th-century treatise on the common law of England by Sir William Blackstone, originally published by the Clarendon Press at Oxford between 1765 and 1769. The work is divided into four volumes, on the rights of persons, the rights of things, of private wrongs and of public wrongs. The Commentaries were long regarded as the leading work on the development of English law and played a role in the development of the American legal system. They were in fact the first methodical treatise on the common law suitable for a lay readership since at least the Middle Ages. The common law of England has relied on precedent more than statute and codifications and has been far less amenable than the civil law, developed from the Roman law, to the needs of a treatise. The Commentaries were influential largely because they were in fact readable, and because they met a need. The Commentaries are often quoted as the definitive pre-Revolutionary source of common law by United States courts. Opinions of the Supreme Court of the United States quote from Blackstone's work whenever they wish to engage in historical discussion that goes back that far, or farther (for example, when discussing the intent of the Framers of the Constitution). The book was famously used as the key in Benedict Arnold's book cipher, which he used to communicate secretly with his conspirator John André during their plot to betray the Continental Army during the American Revolution. In 1765 Blackstone announced his resignation from the Vinerian Chair, effective after his 1766 lectures. These were divided into two 14-lecture series, on "private wrongs" and "public wrongs" delivered between 12 February and 24 April. At this point Blackstone had published nothing new since A Treatise on the Law of Descents in Fee Simple in 1759. The decision to resign was most likely due to the increasing demands of his legal practice and the reduced profit from the lectures, which, after peaking at £340 in 1762, dropped to £239 a year later and to £203 for the final round of lectures in 1765–6.