Image courtesy of the Metropolitan Museum of Art, Gift of J. William Middendorf II, 1968


MIFFLIN, Thomas, a Delegate from Pennsylvania; born in Philadelphia, Pa., January 10, 1744; was graduated from the University of Pennsylvania at Philadelphia in 1760; member of the American Philosophical Society 1765-1799; member of the colonial legislature 1772-1774; Member of the Continental Congress 1774-1775 and 1782-1784, and was its president in 1783; major and chief aide-de-camp to General Washington July 4, 1775; major and Quartermaster General of the Continental Army August 14, 1775, and promoted through the ranks to major general February 19, 1777; member of board of war November 7, 1777; resigned as major general February 25, 1779; trustee of the University of Pennsylvania 1778-1791; served as speaker of the state house of representatives 1785-1788; delegate to the Federal Constitutional Convention in 1787 and signed the Constitution; president of the supreme executive council of Pennsylvania October 1788 to October 1790; president of the state constitutional convention in 1790; Governor of Pennsylvania 1790-1799; again a member of the state house of representatives in 1799 and 1800; died in Lancaster, Pa., January 20, 1800; interment in the front yard of Trinity Lutheran Church.

View Record in the Biographical Directory of the U.S. Congress

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External Research Collections

Library of Congress
Manuscript Division

Washington, DC
Papers: 1758-1794, 6 items. The papers of Thomas Mifflin include notes on metaphysics and the elements of the law of nature (1758-1759) made by him as a student at Philadelphia College, now the University of Pennsylvania.
Papers: In the Marian S. Carson Collection of Manuscripts, ca. 1656-1995, 26.4 linear feet. Subjects include Thomas Mifflin. A finding aid is available in the library.
Papers: In the William A. Oldridge Collection of George Washington's Headquarters Staff Writings, 1775-1962, 200 items. Correspondents include Thomas Mifflin. An index is available in the library.
Papers: In the Nicholas Van Dyke Papers, 1781-1793, 1 volume. Correspondents include Thomas Mifflin.
Papers: In the Henry A. Willard II Collection, ca. 1743-1888, 0.8 linear foot. Persons represented include Thomas Mifflin. A finding aid is available in the library.

The Historical Society of Pennsylvania

Philadelphia, PA
Papers: 1759, 1 volume. A manuscript schoolbook titled "Abridgement of Metaphysics" used by Thomas Mifflin. The schoolbook contains essays on "Mente Humana," "Ontology," and "Of God and His Perfections."

The Morgan Library
Department of Literary and Historical Manuscripts

New York, NY
Papers: 1783, 1 item. A letter from Thomas Mifflin to the governor of Virginia written on November 23, 1783. In the letter, Thomas Mifflin announces the arrival of Mr. Adams' secretary from France with the peace treaty.
Papers: 1793, 1 item. An order signed by Thomas Mifflin to James Martin signed on December 10, 1793. The order specifies payment of seventy dollars to James Martin.

University of Chicago Library
Butler-Gunsaulus Collection

Chicago, IL
Papers: 1786, 1 item. An order signed by Thomas Mifflin to David Rittenhouse, for the payment of the salary of Robert Ralston, 1786 September 27. The order is to pay Robert Ralston twenty-seven pounds five shillings for his wages as a member of the General Assembly.
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Bibliography / Further Reading

Rawle, William. 1830. Sketch of the Life of Thomas Mifflin. Pennsylvania Historical Society Memoirs. 2: 105-126.

Rossman, Kenneth Raitz. "Thomas Mifflin: The Revolutionary Patriot from Pennsylvania." Ph. D. diss., University of Iowa, 1941.

___. Thomas Mifflin and the Politics of the American Revolution. Chapel Hill: University of North Carolina Press, 1952.

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