The Cheltenham Circle (also known as the Cheltenham Group and the Cheltenham Science Fiction Circle) began in 1955 and ended in 1963 -- the 25th issue of Vector noted its expiration. It organized the 1961 Eastercon and is perhaps best known as the organization that originated the Knights of St. Fantony. Prominent members were Eric Jones, Bob Richardson, Norman Shorrock, and Peter Mabey.
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When there's a floreat (Fl.), this indicates the time or times for which we have found evidence that the club existed. This is probably not going to represent the club's full lifetime, so please update it if you can!