Marguerite Marie Alibert, often referred to as Princess Fahmy, Maggie Meller, and Marguerite Laurent, was a French socialite. She began her profession in Paris as a prostitute and courtesan. During 1917 and 1918, she had a relationship with the Prince of Wales (later Edward VIII). When she wed the Egyptian aristocrat Ali Kamel Fahmy Bey, the media of the day referred to her as Princess. She murdered her husband in 1923 at London's Savoy Hotel. During a trial at the Old Bailey, she was ultimately found not guilty. 

Source Materials:

https://www.historicmysteries.com/marguerite-alibert/

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https://culturico.com/2021/11/18/how-privilege-helped-this-wealthy-white-woman-get-away-with-murder/

https://www.thedailybeast.com/the-king-and-the-courtesan-inside-edward-viiis-steamy-french-affair

https://www.brides.com/king-edward-wallis-simpson-relationship-timeline-5193616