On 24 April 1614 Teresa of Avila was beatified in Rome by Pope Paul V (Camillo Borghese). On that day, the pope signed the Brief of Beatification of Our Holy Mother Teresa. We lift up this passage from the Brief:
So, We, having carefully examined this cause, through our venerable brothers the Cardinals of the Holy Roman Church, deputies for the sacred Rites, to whom we entrust their study and having heard their favorable counsel to these requests: grant that from now on all the monasteries and churches of the Discalced Carmelite Order and all the religious of both sexes may celebrate the office and the Mass of Blessed Teresa as Virgin, the day of her glorious transitus; that is, the 5th of October and in the town of Alba, the diocese of Salamanca, in the monastery and in the church where the body of the Blessed Teresa is kept, all priests, both secular and regular, may pray and celebrate the office and the Mass respectively in honor of the blessed Blessed Teresa, according to the rubrics of the Roman Breviary and Missal, a grace which, by virtue of Our apostolic authority and by the present letters, we grant in perpetuity, the Constitutions and apostolic Ordinations, or anything to the contrary notwithstanding.
Source: Efemerides Carmelitanas