The Royal National Institute for Deaf People was founded as the National Bureau for Promoting the General Welfare of the Deaf in 1911 by Leo Bonn (Leo Bernard William Bonn, Lord of the Manor of Newbold Revel) a deaf merchant banker, and philanthropist, in the ballroom of his home, at Bonn House, 22 Upper Brook Street, Mayfair, on 9 June 1911. The house is marked by a memorial plaque unveiled by Prince Philip, Duke of Edinburgh, Patron to the RNID, on 9 June 1998.