Debate is a process that involves formal discourse, discussion, and oral addresses on a particular topic or collection of topics, often with a moderator and an audience. In a debate, arguments are put forward for common opposing viewpoints. Debates have historically occurred in public meetings, academic institutions, debate halls, coffeehouses, competitions, and legislative assemblies. Debate has also been conducted for educational and recreational purposes, usually associated with educational establishments and debating societies. These debates emphasized logical consistency, factual accuracy, and emotional appeal to an audience. Modern forms of competitive debate also include rules for participants to discuss and decide upon the framework of the debate (how the debate will be judged). Debating in various forms has a long history and can be traced back to the philosophical and political debates of Ancient Greece, such as Athenian democracy or the Shastrartha in Ancient India. Modern forms of debating and the establishment of debating societies in the Western world occurred during the Age of Enlightenment in the 18th century. In Imperial China's Han Dynasty, debate amongst scholars was most famously portrayed in a series of debates known as the Discourses on Salt and Iron, held in 81 BCE. Named for its two most famous debates, by Emperor Zhao, these debates focused on the reformation of the economic policies implemented by Zhao's predecessor, Emperor Wu. Trinity College Dublin boasts two of Europe's oldest debating societies: The Phil, founded in 1683, and The Hist in 1770, inspired by a debating club created by Edmund Burke in 1747. Debating societies emerged in London in the early 18th century, and soon became a prominent societal fixture of life in London. Although debating societies had existed in London since at least 1740, they were exclusive and secretive societies. However, by the mid-18th century, London fostered a vibrant debating society culture, largely due to increased membership from London's growing middle class.