In Rome, the Society of Jesus—a Roman Catholic missionary organization—receives its charter from Pope Paul III. The Jesuit order played an important role in the Counter-Reformation and eventually succeeded in converting millions around the world to Catholicism.

The Jesuit movement was founded by Ignatius de Loyola, a Spanish soldier turned priest, in August 1534. The first Jesuits–Ignatius and six of his students–took vows of poverty and chastity and made plans to work for the conversion of Muslims. If travel to the Holy Land was not possible, they vowed to offer themselves to the pope for apostolic work. Unable to travel to Jerusalem because of the Turkish wars, they went to Rome instead to meet with the pope and request permission to form a new religious order. In September 1540, Pope Paul III approved Ignatius’ outline of the Society of Jesus, and the Jesuit order was born.

Under Ignatius’ charismatic leadership, the Society of Jesus grew quickly. Jesuit missionaries played a leading role in the Counter-Reformation and won back many of the European faithful who had been lost to Protestantism. In Ignatius’ lifetime, Jesuits were also dispatched to India, Brazil, the Congo region, and Ethiopia. Education was of utmost importance to the Jesuits, and in Rome Ignatius founded the Roman College (later called the Gregorian University) and the Germanicum, a school for German priests. The Jesuits also ran several charitable organizations, such as one for former prostitutes and one for converted Jews. When Ignatius de Loyola died in July 1556, there were more than 1,000 Jesuit priests.

During the next century, the Jesuits set up ministries around the globe. The “Black-Robes,” as they were known in Native America, often preceded other Europeans in their infiltration of foreign lands and societies. The life of a Jesuit was one of immense risk, and thousands of priests were persecuted or killed by foreign authorities hostile to their mission of conversion. However, in some nations, such as India and China, the Jesuits were welcomed as men of wisdom and science.

With the rise of nationalism in the 18th century, most European countries suppressed the Jesuits, and in 1773 Pope Clement XIV dissolved the order under pressure from the Bourbon monarchs. However, in 1814, Pope Pius VII gave in to popular demand and reestablished the Jesuits as an order, and they continue their missionary work to this day. Ignatius de Loyola was canonized a Catholic saint in 1622.