Mary Sibbet Copley

Mary was born at Appleby Manor near Kittanning, PennsylvaniainArmstrong County on June 19, 1843.^[2][3] She was the daughter of Margaret and Josiah Copley,^[4] a pioneer editor who was well known in the community.^[5]

In 1867, she married William Thaw, Sr. (1818–1889) after the death of his first wife.^[6][7] Together, they had five children that survived childhood:

• Harry Kendall Thaw (1871–1947), who would later murder Stanford White^[8][9][10] In his will, he left $10,000, less than 1% of his fortune, to wife Evelyn Nesbit.^[11]
• Edward Thaw (1873–1924), who married Jane Olmsted (1880–1958)
• Josiah Copley Thaw (1874–1944), who married Mary Harrington Thomson (1881–1947)
• Margaret Copley Thaw (1877–1942),^[12] who first married George Lauder Carnegie (1876–1921), nephew of Andrew Carnegie. After his death, she married Roger, Comte de Périgny and became Countess de Périgny.^[13][14]
• Alice Cornelia Thaw (1880–1955), who married George Seymour, 7th Marquess of Hertford (1871–1940).^[15] They divorced and she married Geoffrey George Whitney, Sr. in 1913.^[16]

She died, a few days before her 87th birthday, on June 9, 1929, of pneumonia.^[17] She was buried in Allegheny Cemetery in Pittsburgh.^[6][7][18]

After her husband's death in 1889, she used the wealth she inherited to fund archaeology research, including funds for prominent women archaeologists including Alice Fletcher and Zelia Nuttall.^[19] Thaw also funded the Thaw Fellowship at the Peabody Museum of Archaeology and EthnologyatHarvard College.^[3]

Thaw was also the primary philanthropist supporting the Omaha Presbyterian Theological Seminary. After her initial contribution of the Cozzens Hotelindowntown Omaha in 1902, she made regular donations, practically underwriting the institution. In 1929, she left a bequest of $150,000 to the seminary.^[20]

• Mary Sibbet CopleyatFind a Grave