Alonso de León

Alonso de León "El Mozo" (c. 1639–1691) was an explorer and governor in New Spain who led several expeditions into the area that is now northeastern Mexico and southern Texas.

[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").

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.

It was during De León's fourth expedition, in 1689, that he finally discovered La Salle's settlement, which had been abandoned by that time.

He was involved in establishing San Francisco de los Tejas in 1690, the first Spanish mission in East Texas.