born Oct. 23, 1750, Charleston, S.C.
died Nov. 2, 1828, Charleston, S.C., U.S.
U.S. soldier, politician, and diplomat.
The brother of Charles C. Pinckney and a cousin of Charles Pinckney , he served as governor of South Carolina (178789) and as minister to Britain (179296). As special envoy to Spain (1795), he negotiated the Treaty of San Lorenzo, also called Pinckney's Treaty, which fixed the southern border of the U.S. and granted the U.S. navigation rights on the Mississippi River and the right of deposit (storage of goods) at New Orleans. He was a major general in the War of 1812 .