In 1527, Cabeza de Vaca appeared at the royal court in Valladolid and received an appointment as royal treasurer for an expedition to be led by conquistador Pánfilo de Narváez to explore and conquer La Florida, a portion of North America roughly comprising today's southeastern United States. The reasons for his selection are not known but his history of loyal military service to the crown was certainly a critical qualification. He also had a relative, Luis Cabeza de Vaca, serving on the all-important Council of the Indies.