Humana and Leyva expedition
Antonio Gutiérrez de Umaña and Francisco Leyva de Bonilla, Spanish colonists, made an unauthorized expedition to the Great Plains of North America in 1594 or 1595. A native, Jusepe Gutiérrez, was the only survivor and the source of fragmentary information about the expedition. The route Umaña and Leyva followed can not be determined with certitude, but it probably included traveling to what is today the U.S. states of Texas, Oklahoma, and Kansas.