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Gregorio Cortez, played by Edward James Olmos in the film, was a legendary Tejano folk hero known for his bravery and resourcefulness. Set in 1901 in South Texas, the story revolves around Cortez's flight from pursuing Texas Rangers after he kills a lawman in self-defense. The ballad highlights themes of justice, the abuse of authority, and the strength of the human spirit in the face of adversity.