 In 1786 Arredondo was named regent of the Audiencia, and a short time later captain general (military commander) of the viceroyalty.In 1808 he was granted the title of marqués de San Juan Nepomuceno.Upon the death of Viceroy Ambrosio O'Higgins in Lima on March 19, 1801, Arredondo took office as interim viceroy (by virtue of his position as head of the Audiencia).