Mary Duke Biddle Trent Semans
Mary Duke Biddle Trent Semans (February 21, 1920 – January 25, 2012) was an American heiress and philanthropist. She was the granddaughter of Benjamin N. Duke and the great-granddaughter of Washington Duke, both tobacco and energy tycoons who helped start Duke University. Semans is remembered for her support and work towards promoting the arts and humanities through various philanthropic entities.
Personal facts
| Birth date | February 21, 1920 |
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| Birth name | Mary Duke Biddle |
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| Date of death | January 25, 2012 |
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| Parents | Anthony Joseph Drexel Biddle Jr. |
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