In the following year Vieira arrived from Brazil and was not only made tutor to the Infante, Don Pedro, as well as court preacher, but was appointed member of the royal council. In the last-named office he reorganized the departments of the army and navy, gave a new impetus to commerce, urged the foundation of a national bank, and the organization of the Brazilian Trading Company, readjusted the taxation, curbed the Portuguese Inquisition, and was mainly instrumental in gaining the national victories of Elvas, Almeixal, Castello Rodrigo, and Montes Claros. Between 1646 and 1650 he went on diplomatic missions to Paris, the Hague, London, and Rome, but refused the title of ambassador and also the offer of a bishopric. He wanted something else, namely, to work among his Indians, and he returned to Brazil in 1652. There he provoked the wrath of the slave-owners by his denunciation of their ill-treatment of the negroes and Indians, and was soon back in Lisbon pleading the cause of the victims. He won his case, and, in 1655, we find him once more at his missionary labors in Brazil, evangelizing the cannibals, translating the catechism into their idioms, travelling over steep mountain ranges and paddling hundreds of miles on the Amazon and its numberless tributaries. Eleven times he visited every mission post on the Maranhon, which meant twenty journeys along the interminable South American rivers, on some of which he had to keep at the oar for a month at a time. It is estimated that he made 15,000 leagues on foot, and advanced 600 leagues farther into the interior of the continent than any of his predecessors. He continued this work till 1661, and then the slave-owners rose against him with greater fury than ever, and sent him a prisoner to Lisbon. He was no longer as welcome at court as previously, for the degenerate Alfonso, who had to be subsequently deposed, was on the throne. In 1665 the Inquisition forbade him to preach, and flung him into a dungeon, where he lay till 1667, when he was released by the new king Pedro II. He then went to Rome, and was welcomed by the Pope, the cardinals, and the General of the Order, Father Oliva.