The Basilica of St. Mary of the Angels and the Martyrs (Latin: Beatissimae Virgini et omnium Angelorum et Martyrum, Italian: Santa Maria degli Angeli e dei Martiri) is a titular basilica church in Rome, built inside the frigidarium of the Baths of Diocletian. The Cardinal priest of the Titulus S. Mariae Angelorum in Thermis is William Henry Cardinal Keeler.