Castano De Sosa, Gaspar
CASTAÑO DE SOSA, GASPAR (?–?). Gaspar Castaño de Sosa was born in Portugal, probably around the middle of the sixteenth century. By the late 1580s, he was a longtime associate of Luis de Carvajal y de la Cueva on the northeastern frontier of New Spain. Carvajal named Castaño as alcalde mayor of Villa San Luis (later Monterrey), and with the arrest of Carvajal on orders of the Holy Office of the Inquisition, Don Gaspar assumed leadership at Villa de Almadén (now Monclova). On July 27, 1590, Castaño, who had become disillusioned with the unproductive mines of Almadén, packed up most of the colony and set out on an arduous march to northern New Mexico.
Full article on the Texas State Historical Association's Handbook of Texas Online