The 1527 Narváez expedition was a disaster. Only four of the approximately 600 men to go on it survived. Some died when two of the ships were sunk in a hurricane. Some deserted when they reached Cuba. The rest died from starvation, disease or in conflicts with the natives.
But one of the four men who survived was Álvar Núñez Cabeza de Vaca, originally sent on the mission as the king’s eyes and ears. He had been the treasurer and sherriff (responsible for making sure the crown got its 20% cut) and also the second in command. In 1536, he finally made his way to Mexico City, having trekked from where he was shipwrecked on Galveston Island (near the site of present day Houston, Texas) in November 1528. The following year, he returned to Spain and wrote a book: La relación of Álvar Núñez Cabeza de Vaca.
This book introduced the idea of the “Seven Cities of Gold” or “Seven Cities of Cíbola”, which were said to be located somewhere on the other side of the desert north of Mexico and rich beyond all imagining. Sadly, when conquistador Francisco Vázquez de Coronado finally arrived at Cíbola in 1540, he discovered that the stories were unfounded and that there were, in fact, neither treasures nor cities in Cibola.
By Unknown – http://www.ushistoryscene.com/wp-content/uploads/2013/08/cabeza-de-Vaca-Portrait-1.jpg, Public Domain, Link
As mentioned in: