Saint Teresa, of Ávila

Saint Teresa of Ávila was a Spanish Carmelite nun, mystic, and reformer of the Carmelite Order. She is known for her writings on mental prayer and spiritual life, including the books 'The Interior Castle' and 'The Way of Perfection.' Teresa played a significant role in the Catholic Reformation by establishing new convents and promoting contemplative practices. She was declared a Doctor of the Church for her profound theological contributions.