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William Murray, 1st Earl of Mansfield, PC (2 March 1705 – 20 March 1793), was a British judge, politician, lawyer, and peer best known for his reforms to English law. Born in Scone Palace, Perthshire, to a family of Scottish nobility, he was educated in Perth before moving to London at the age of 13 to study at Westminster School. Accepted into Christ Church, Oxford, in May 1723, Mansfield graduated four years later and returned to London, where he was he was called to the Bar by Lincoln's Inn in November 1730 and quickly gained a reputation as an excellent barrister.

He became involved in British politics in 1742, beginning with his election to the House of Commons as a Member of Parliament for Boroughbridge and appointment as Solicitor General. In the absence of a strong Attorney General, Mansfield became the main spokesman for the government in the House of Commons, where he was noted for his "great powers of eloquence" and was described as "beyond comparison the best speaker". With the promotion of Sir Dudley Ryder to Lord Chief Justice in 1754, Mansfield became Attorney General and, when Ryder unexpectedly died several months later, he took his place as Chief Justice.

As the most powerful British jurist of the 18th century, Mansfield's decisions reflected the Age of Enlightenment and moved the country onto the path to abolishing slavery. He advanced commercial law in ways that helped establish Britain as world leader in industry, finance, and trade; modernised both English law and England's courts; rationalised the system for submitting motions, and reformed the way judgments were delivered to reduce expense for the parties. For his work in Carter v Boehm and Pillans v Van Mierop, Mansfield has been called the founder of English commercial law. (Full article...)