 He had much influence with his fellow "oidores".As president of the Audiencia at the time of the death of Viceroy Melchor Portocarrero, 3rd Count of Monclova on September 15, 1705, Núñez de Sanabria took over the government of the colony on an interim basis, until Manuel de Oms y de Santa Pau succeeded him in May 1707.He served as interim viceroy again, briefly, from April to September 1710.