Alonso de León (c. 1639–1691) wasexplorer and governor, who led several expeditions into the area that is now northeastern Mexico and southern Texas.
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De León was born in 1639 or 1640 in the settlement of Cadereyta (presently Montemorelos) within the province of Nuevo León in New Spain. He was the third son of Alonso De León and Josefa González.[1] To distinguish him from his father, who was also a prominent leader in the colony, sometimes the phrase "El Mozo" would later be appended to his name (or its English equivalent, "the younger").
De León trained in Spain for a naval career and joined the Spanish navy in 1657. By 1660 he had returned to Nuevo León, where he became a frequent leader of exploratory parties as well as an entrepreneur, most notably in salt mining. De León married Agustina Cantú and had six children.
In 1684, French explorer La Salle led an ill-fated expedition which was intended to establish a colony at the mouth of the Mississippi River. Instead, the colonists ended up on the Texas coast, where La Salle established Fort Saint Louis. When Spanish leaders received word that the French had founded a settlement in the northern portion of their territory, De León was chosen to lead the effort to locate and expel the French colonists.
The first two expeditions, in 1686 and 1687, yielded no evidence of the French colony. One Frenchman, Jean Gery, was captured during the third expedition in 1688. It was during De León's fourth expedition, in 1689, that he finally discovered Fort Saint Louis, which had been abandoned by that time.
De León served as mayor of Cadereyta from 1667 to 1675. He was governor of Nuevo León from 1682 to 1684. In 1687, he became governor of the region of Coahuila.
He was involved in establishing San Francisco de los Tejas in 1690, the first Spanish mission in East Texas. In doing so, he blazed the trail for much of the Old San Antonio Road. As a result of his explorations, he was responsible for the names of several Texas rivers, including the Guadalupe River, the Medina River, the Nueces River, and the Trinity River.
De León died in Coahuila on March 20, 1691.