Final answer:
Ignatius of Loyola founded the Society of Jesus, known as the Jesuits, which was instrumental in educational work, conversions, and advising Catholic rulers.
Step-by-step explanation:
The Society of Jesus, also known as the Jesuits, was founded by Ignatius of Loyola. This religious order was established during the Catholic Reformation and became known for its educational pursuits, the conversion of non-Christians to Roman Catholicism, and serving as advisers to Catholic rulers in Europe. The Jesuits played a crucial role in the Catholic Church's response to the spread of Protestantism, which was spearheaded by figures like Martin Luther and John Calvin.