Charterhouse School is a famous English public school, located in Godalming in the county of Surrey. It was founded by Thomas Sutton in London in 1611 on the site of the old Carthusian Monastery in Charterhouse Square, Smithfield (see Charterhouse). It is one of the original nine English public schools as defined by the Public Schools Act 1868. Today, pupils are still referred to as Carthusians, and ex-pupils as Old Carthusians or OCs. As of 2006, Charterhouse is Britain's most expensive school with boarding and tutorial fees of £25,000+ per annum.