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Chatham House, also known as The Royal Institute of International Affairs, is a research institute and think tank, which emerged out of the 1919 Paris Peace Conference, along with its sister organisation, the New York-based Council on Foreign Relations. Chatham House (the name coming from the building the Institute is housed in) "has given its name to the famous Chatham House Rule, first established in 1927 and revised twice since. The rule is applied at meetings at which 'participants are free to use the information received, but neither the identity nor the affiliation of the speaker(s), nor that of any other participant, may be revealed.'" Source: Dango database of archives of non-governmental organisations at http://www.dango.bham.ac.uk/