Countess Margaret Copley de Perigny

Margaret Copley Thaw was the Countess de Périgny, and a philanthropist.

She was born on January 3, 1877 to William Thaw and Mary Sibbet Copley.

In 1898, she married George Lauder Carnegie, the nephew of industrialist Andrew Carnegie.

In Paris on November 12, 1923, she married Roger, Comte de Périgny. After they married, the lived at the Plaza Hotel in New York. In 1924, she was sued by Madeline Helen Modica of Newark for over an apparent affair with Madeline's husband, Emmanuel Victor Modica, a car salesman. They later moved abroad and spent their time between his Paris home and the farm and estate they built in 1926 on land at the Lake Naivasha known as Kongoni Farm. The farm was a 15,600 acre ranch.

She died on January 9, 1942 at Kongoni Farm in what was then the British East African colony of Kenya. The farm and a life interest in her $2,000,000 estate was left to her husband.