Philologist; born in the Isle of Rhea
, June 3, 1760; went to Paris
in 1775, where he became acquainted with Baron Steuben
, and accompanied him to America
as his secretary.
He was brevetted a captain (February, 1778), and assisted Steuben
in the preparation of his system of military tactics for the use of the United States troops.
From 1781 to 1783 he was secretary to Robert R. Livingston
, then at the
head of the foreign office of the government; and then studying law, was admitted to practice in 1785, becoming eminent in the profession on questions of civil American Indians.
In 1819 he published and international law. He finally devoted himself to literature and science, and made many valuable researches into the language and literature of the North
a Memoir on the structure of the Indian Languages
When seventy-eight years of age (1838) he published a Dissertation on the Chinese language
; also a translation of a Description of New Sweden
In 1835 the French Institute awarded him a prize for a disquisition on the Indian
languages of North America
. Mr. Duponceau
opened a law academy in Philadelphia
in 1821, of Pierre Samuel Du Pont de Nemours
; and wrote several essays on the subject of law. He died in Philadelphia
, April 2, 1844.