A. V. Dicey
Albert Venn A. V. Dicey KC was a British jurist and constitutional theorist, and was the younger brother of Edward Dicey. He is most widely known as the author of Introduction to the Study of the Law of the Constitution . The principles it expounds are considered part of the uncodified British constitution. He became Vinerian Professor of English Law at Oxford and a leading constitutional scholar of his day. Dicey popularised the phrase rule of law, although its use goes back to the 17th century.
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Source: Wikipedia