The principle of rule of law was popularized by A.V. Dicey. Dicey was a British jurist and constitutional theorist who lived in the 19th century. He wrote a book titled "Introduction to the Study of the Law of the Constitution" in which he outlined the principles of the rule of law. According to Dicey, the rule of law means that no one is above the law and everyone, including government officials, must obey the law. He argued that the rule of law is essential for protecting individual rights and ensuring a fair and just society. Dicey's ideas have had a significant influence on the development of constitutional law and the rule of law in many countries around the world.