Juan Nepomucema Seguin was born in Spanish San Antonio on October 27, 1808 to Juan José Erasmo and María Josefa Becerra Seguin. Erasmo was descended from one of sixteen families who came to the San Antonio area from the Canary Islands in the early 1700s. The Seguin cattle ranch covered portions of three current Texas counties: Bexar, Guadalupe and Wilson. Erasmo served as postmaster of San Antonio from 1807 to 1835, mayor (alcalde) of San Antonio from 1820-1821 and quartermaster of Presidio de San Antonio de Béxar from 1825 to 1835. Erasmo was acquainted with Moses Austin who was succeeded by his son, Stephen F. Austin. Along with Don Martin de Veramendi, Erasmo assisted them in obtaining their Austin Colony grant.
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