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Luis de Carvajal (sometimes Luis de Carabajal y de la Cueva) (c. 1537 – 13 February 1591) was governor of the Spanish province of Nuevo León in present-day Mexico, slave dealer, and the first Spanish subject known to have entered Texas from Mexico across the lower Rio Grande. He was a Portuguese-born, Spanish Crown officer, who in 1579 was awarded a large swath of territory in New Spain, known as Nuevo Reino de León. Wikipedia