Answer. Thayendanegea or Joseph Brant (March 1743 – November 24, 1807) was a Mohawk military and political leader, based in present-day New York, who was closely associated with Great Britain during and after the American Revolution. Perhaps the Native American of his generation best known to the Americans and British, he met many of the most significant Anglo-American people of the age, including both George Washington and King George III.