or Theresa Teresa Saint

Teresa, or Theresa, Saint (1515–82), also known as Theresa of Ávila, Spanish nun and Doctor of the Church. She worked toward reforming the Carmelite order, which she believed was lacking in self-denial and austerity, and in 1562, with approval from the pope, established her own convent. She was a leading figure in the Catholic Reformation. Her writings rank among the greatest in mystical literature. St. Teresa was considered a miracle worker and was canonized in 1622. Her feast day is Oct. 15.