Adams–Onís Treaty
Luis de Onís y González-Vara (June 4, 1762 – May 17, 1827) was a career Spanish diplomat who served as Spanish Envoy to the United States from 1809 to 1819, and is remembered for negotiating the cession of Florida to the US in the Adams–Onís Treaty with United States Secretary of State John Quincy Adams, in 1819.