Rearranging the letters of 'Prince of Wales' (British royal family) gives:
Crown if asleep.
(by stephen clarke) (1995)
Other related anagrams without their own page:
"Prince Harry Wales" -> "Nicer prayer shawl." (by Al McCartan using Anagram Genius) (2007) (pending approval)
"The Diana Princess of Wales Memorial Fountain in Hyde Park" -> "Form "an anachronism", like an open filthy sewer. A stupid idea." (by David Bourke using Anagram Genius) (2004)
"The Diana Princess of Wales Memorial Fountain in Hyde Park" -> "I am a puny and effeminate inane; crash kills poor Di. Worst, eh?" (by Chris by hand) (2006) (pending approval)
"The Diana Princess of Wales Memorial Fountain" -> "Lifts as a fine showpiece? Or a monumental drain?" (by Tony Crafter using Anagram Genius) (2004)
"I, Diana, The Princess of Wales" -> "I die in fatal crash. Sons weep." (by Judson T. Pewther using Anagram Genius) (2007) (pending approval)
"His Royal Highness, Charles, The Prince of Wales" -> "We hope he'll chastise his self-caring son Harry." (by Tony Crafter by hand) (2005)
"Prince Charles and Camilla to appear on postage stamps" -> "Slaphead palace parasite, contrasting common slapper." (by David Bourke using Anagram Genius) (2005)
"The sixtieth birthday of Prince Charles" -> "HRH: "British throne? Fact is, I expect delay!"" (by Mike Mesterton-Gibbons by hand) (2008) (pending approval)
"Prince Charles wants everyone to exercise more" -> "Extreme, reactionary evil wrenches one's corpse." (by John Dyke using Anagram Genius) (2006) (pending approval)