Book excerpt: Capt. Marcos Alonso Garza was from Lepe in Huelva province in Andalucia, Spain, and immigrated to Mexico City, where he married Juana de Treviño. He moved to Guadiana (now the city of Durango), Durango, and later possibly married Catalina Martínez Guajardo. He then moved to Monterrey, Nuevo León, and died before 1643. Some of his sons used surnames of "Garza," "de la Garza," and "de Treviño" (it was quite common for later sons to use a mother's surname). Descendants and relatives lived in Durango, Nuevo León, Tamaulipas, Coahuila and elsewhere.