He first tried to travel to Rome in 1617 or 1618, but made it only as far as Florence, where, as his biographer Bellori reported, "as a result of some sort of accident, he returned to France." On his return, he began making paintings for Paris churches and convents. In 1622 made another attempt to go to Rome, but went only as far as Lyon before returning. In the summer of the same year, he received his first important commission: the Order of Jesuits requested a series of six large paintings to honor the canonization of their founder, Saint Francis Xavier. The originality and energy of these paintings (since lost) brought him a series of important commissions.