The Latin word Missa, the Catholic Mass or Eucharist, is found in the title of many polyphonic settings of the liturgical texts. The phrase Missa brevis, short Mass, was at first used to indicate a Mass with shorter musical settings of the Ordinary. It later came to be used on occasion for settings that included only the first two parts of the ordinary of the Mass, the Kyrie and the Gloria. Mass titles, particularly in the 16th century, are often distinguished by the musical material from which they are derived, sacred or secular, as in Missa Adieu mes amours, or Missa Ave Regina. The Missa Papae Marcelli, the Mass of Pope Marcellus, is the setting of the Mass written by Palestrina, supposedly to preserve polyphony from condemnation by the Council of Trent.