A standard 15 Mysteries of the Rosary, based on the long - standing custom, was established by Pope Pius V during the 16th century, grouping the mysteries in three sets: the Joyful Mysteries, the Sorrowful Mysteries, and the Glorious Mysteries. During 2002 Pope John Paul II said that it is fitting that a new set of five be added, termed the Luminous Mysteries, bringing the total number of mysteries to 20. These mysteries had been used by Holy Cross father Patrick Peyton during the 20th century. The Glorious mysteries are said on Sunday and Wednesday, the Joyful on Monday and Saturday, the Sorrowful on Tuesday and Friday, and the Luminous Mysteries are said on Thursday. Usually five decades are recited in a session.
who added the luminous mysteries to the rosary
Pope John Paul II