Saint Teresa's birthplace is Avila, a city in Spain. It is located in the province of Castile and Leon and is known for its medieval walls, which were built in the 11th century. Avila is also the birthplace of Saint Teresa of Avila, a 16th-century Spanish mystic and Carmelite nun. She is one of the most important figures in the history of Spanish spirituality and is considered to be one of the great mystics of the Catholic Church.