From the Wikipedia page 
The Richard III Society was founded in 1924 by Liverpool surgeon S. Saxon Barton as The Fellowship of the White Boar, Richard's badge and a symbol of the Yorkist army in the Wars of the Roses. Its membership was originally a small group of interested amateur historians whose aim was to bring about a re-assessment of the reputation of Richard III.
The society became moribund during the Second World War. In the 1950s Josephine Tey published her detective novel The Daughter of Time, in which Richard’s guilt is examined and doubted, Laurence Olivier released the film of Shakespeare's Richard III (1955 film), which at the beginning admitted it was unhistorical, and a sympathetic, detailed biography of Richard was published by Paul Murray Kendall, all of which went some way towards re-invigorating the society.
The Fellowship of the White Boar was renamed The Richard III Society in 1959. In 1980, Prince Richard, Duke of Gloucester became the society’s Patron. (Richard III was Duke of Gloucester before ascending the throne, therefore he was before his ascension (Prince) Richard, Duke of Gloucester).
In 2012 the society, working in partnership with the University of Leicester and Leicester City Council, exhumed a body at the site of the former Greyfriars Church that was later confirmed to be that of the King
The website is