In 1923 in London there was a sensational trial. Princess Marguerite Fahmy (a Frenchwoman) was accused of the murder of her Egyptian husband, Prince Fahmy Bey, whom she shot one evening while they were staying at the Savoy Hotel.
She got off because her defence counsel, the famous Marshall Hall, cast several racist aspersions against the dead husband of sexual perversions of all kinds. Before her marriage Marguerite supposedly had a long affair with the Prince of Wales, the future Edward VIII when he was stationed in France during World War One.
There was a C4 documentary a few years back on this.
Duke Charles Edward of Sachsen-Coburg-Gotha was convicted for war crimes after WWII for his role as President of the German Red Cross.
Although he was merely a figurehead the Red Cross was an integral part of the Nazi party and its role in the Holocaust is still a subject of debate.
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Princess Anne of the british royal family: i've heard that she has been charged twice. Once for driving too fast, once as her dog, dottie, attacked people on their bicycles