The Pope sent Mazarin to Paris at the beginning of 1631 to work out the final details of the agreement. He returned to France again from April to July 1632. He had his first interview with Lous XIII and with the Queen, Anne of Austria, in May 1632. He tried to persuade Louis XIII to send a military expedition to capture Geneva, the fortress of the Protestant movement, but the King, who had good relations with the Swiss cantons, rejected the idea. Mazarin returned to Rome in November 1632, and made a new friend and ally, Antonio Barberini, the nephew of the Pope and one of his chief diplomats, and his older brother, Francesco Barberini, the State Secretary of the Vatican. With their assistance, he established himself as a guardian of French interests at the Vatican, and then of Vatican interests in France. In 1632, he was named papal vice-legate at Avignon, and given the religious title of prelate, and began to wear an ecclesiastical costume, though he was not and never became a priest.