Saint John of Avila (1499-1569) was a Spanish priest and theologian known for his role in the Catholic Reformation. He was a prominent figure in the Counter-Reformation, advocating for spiritual renewal and education within the Church. His writings, particularly on the spiritual life, influenced many, including Saint Ignatius of Loyola. In 1970, he was declared a Doctor of the Church, recognizing his significant contributions to Christian thought. His feast day is celebrated on May 10, and he is the patron saint of Spanish clergy. Saint John of Avila's legacy continues to inspire those seeking a deeper spiritual life.