Saint Teresa Sanchez Cepeda Davila y Ahumada of Ávila (1515–82) was a Spanish Carmelite nun and mystic. She is one of the greatest religious women of the Roman Catholic Church.
Born to a prosperous family in Gotarrendura, Spain, Teresa combined a private meditative life with an exceptional public activism on behalf of the church. She founded the Discalced Carmelite Order (“discalced” meaning “shoeless”) with support from St. John of the Cross.
Teresa’s religious writings, including The Way of Perfection (1583) and The Interior Castle (1588,) have inspired spiritual devotion for over three centuries and have spawned a considerable body of scholarly work. Her feast day is October 15.