 He started his professional career between 1803 and 1804 , in the office of Augustine Gascón , officiating as labour counselor for Indians . As a result , he confronted powerful people like the mayors of Cochabamba and <unk> . He left the city after being threatened , and returned to Buenos Aires in 1805 with his wife Maria Guadalupe Cuenca and their newborn son . Once in the city , he became a reporter of the hearings of the Royal Audiencia , a local appeal court . The Buenos Aires Cabildo , the local council , hired him as an advisor as well . He defended Melchor Fernández , aggrieved by Bishop Benito Lue y Riega , in one of his first cases . In another of his early disputes he backed the Cabildo in denying the appointment as an ensign of the young Bernardino Rivadavia . 
