In 1492, Christopher Columbus "discovered" North America while on an expedition to find riches in India for Spain.
In 1519, Alonso Alvarez de Pineda became the first European to explore the Texas coast (Gulf of Mexico). He the first to map the Texas Coast.
I found no gold...
In 1519, Hernán Cortés invaded Mexico, conquered the Aztecs, and found gold.
In 1528, Alavar Nunez Cabeza de Vaca ship wrecked on Galveston Island while on an expedition to find gold and was taken in by the Karankawas and used as slaves. He was the one to start the oax about the seven cities of gold
In 1540, Francisco Vázquez de Coronado went on an expedition to the new world to find gold and silver, but he failed and was considered a failure to the Spanish. But he also made the first maps of the Southwest, which was a big accomplishment.
In 1648, René-Robert Cavelier, Sieur de La Salle arrived in Texas. He conquered most, if not all the land around the Mississippi River and built forts for France.