Early Texas Explorers K.F By lemons.class Period: Jan 1, 1500 to Dec 31, 1700 Early Texas Explorers Jun 2, 1519 Alonso Alvarez de Pineda Alvarez de Pineda explored the Texas Coastline for Spain in 1519. Nov 28, 1528 Cabeza de Vaca Cabeza de Vaca explored the Texas Interior for Spain in1528. Jul 7, 1540 Francisco Vasquez de Coronado Francisco de Coronado explored northern Texas in Spain in 1540. May 21, 1542 Hernando de Soto Hernando de Soto explored near the Mississippi River for Spain in 1542. Mar 20, 1684 Minet Minet explored the Mississippi River in Texas for France in 1684. Feb 20, 1685 Sieur de La Salle Sieur de La Salle explored in Texas near the Gulf of Mexico in 1685 for France. Apr 22, 1690 Alanso de Leon Alonso de Leon explored the Texas Coast for France in 1690.