Ignatius of Loyola, the founder of the Jesuits, celebrated his first Mass.

WSJ: Humility in Pope Francis' First Hours

So we have the first pope to be elected from the Society of Jesus, known as the Jesuits, who were founded by Ignatius of Loyola in the 16th century while Catholicism reeled from Protestant challenges.

CNN: Pope Francis, humble, authentic and credible

The late cardinal of Florence and right-hand man of Pope Paul VI, Giovanni Benelli who crossed swords with Escriva over the years nevertheless once said that what Saint Ignatius of Loyola, the founder of the Jesuits, was to the sixteenth-century Council of Trent, Escriva was to the Second Vatican Council.

NPR: A Glimpse Inside a Catholic 'Force': Opus Dei