According to legend, the seven cities of gold referred to Aztec mythology revolving around the Pueblos of the Spanish Nuevo México, modern New Mexico and Southwestern United States.
In the 16th century, the Spaniards in New Spain (Mexico) began to hear rumors of "Seven Cities of Gold" called "Cíbola" located across the desert, hundreds of miles to the north.
[3] The stories may have their root in an earlier Portuguese legend about seven cities founded on the island of Antillia by a Catholic expedition in the 8th century, or one based on the capture of Mérida, Spain, by the Moors in 1150.
The later Spanish tales were largely caused by reports given by the four shipwrecked survivors of the failed Narváez expedition, which included explorers Álvar Núñez Cabeza de Vaca and Estevanico.
However, 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, no treasures as the friar had described—only adobe towns.