Saint Ignatius Loyola, the founder of the Society of Jesus. He was noted for his miltancy and obedience of the will.

From The Catholic Encyclopedia:

The Society of Jesus is a religious order founded by Saint Ignatius Loyola. Designated by him "The Company of Jesus" to indicate its true leader and its soldier spirit, the title was Latinized into "Societas Jesu" in the Bull of Paul III approving its formation and the first formula of its Institute ("Regimini militantis ecclesia", 27 Sept., 1540). The term "Jesuit" (of fifteenth-century origin, meaning one who used too frequently or appropriated the name of Jesus), was first applied to the society in reproach (1544-52), and was never employed by its founder, though members and friends of the society in time accepted the name in its good sense. The Society ranks among religious institutes as a mendicant order of clerks regular, that is, a body of priests organized for apostolic work, following a religious rule, and relying on alms for their support.