Agustin de la Garza was born circa 1736, the son of Antonio de la Garza and Margarita de la Serna.
He married Maria Antonia Gonzalez.
In 1769, as the son of an antiguo poblador, he was granted Camargo 73 by the King of Spain.
In 1796, he sold Camargo 75 to Juan Bautista Villarreal.
In 1778, he sold Camargo 73 to Josefa Guajardo. Deed not executed until 1798. See Seabury and Escobar, Family Tree Book, p.344; Sáenz Ramírez, Protocolos de Camargo, p.261.