Ignatius of Loyola, also known as Saint Ignatius, was a Spanish Basque priest and theologian who founded the Society of Jesus, also known as the Jesuits. He is best known for his spiritual writings, particularly his book "The Spiritual Exercises," which outlines a set of meditations, prayers, and mental exercises designed to help individuals deepen their relationship with God. Ignatius of Loyola is considered a significant figure in the Catholic Church and is recognized for his contributions to education, missionary work, and spiritual formation. He was canonized as a saint in 1622 and is celebrated on July 31st.