Mediavilla Y Azcona, Melchor De
MEDIAVILLA Y AZCONA, MELCHOR DE (?–?). As the lieutenant governor, appointed by Governor Fernando Pérez de Almazán, Capt. Melchor de Mediavilla y Azcona of the presidio at Los Adaes served as interim and acting governor of Texas after the resignation and departure of the governor and continued in office until the viceroy appointed a new governor in 1731.
Full article on the Texas State Historical Association's Handbook of Texas Online