"In 1810 Joseph Sellis, valet to the unpopular royal prince, the Duke of Cumberland, had died from a razor cut to the throat. The official verdict was suicide, but neither opposition circles nor the truculent 'crowd' was satisfied. The metropolis hummed with rumours: of mysterious inconsistencies in the evidence; of Cumberland's previous sexual intimacies with Sellis; of possible blackmail, given that Sellis had himself been a political radical."
http://www.regencyhistory.net/2013/05/the-scandalous-death-of-duke-of.html
http://rictornorton.co.uk/eighteen/cumber1.htm
http://www.historytoday.com/iain-mccalman/radical-rogues-and-blackmailers-regency-period
http://www.walksoflondon.co.uk/37/royal-ghosts-at-st-jamess.shtml
http://rosenbach.blogspot.com/2010/01/italian-assassin-rosenbach-collections.html