Elizabeth Schuyler Hamilton
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After her husband’s death Hamilton remained dedicated to preserving his legacy, working to ensure his biography would be written and establishing his authorship of Washington’s Farewell Address. In addition, she helped to found the Orphan Asylum Society in 1806, and, first as second directress and later as first directress, oversaw the construction of a children’s orphanage as well as a school she founded in Upper Manhattan. She lived to the age of ninety-seven, having retained her role as first directress of the OAS until only six years before her death.
(Elizabeth Schuyler Hamilton’s Wikipedia page had been extensively edited recently by the RWP. If you have anything to add to it, go ahead!)