The Leonine Prayers are a prescribed set of Catholic prayers for recitation by the priest and people after Low Mass required within the Roman Rite of the Latin Church from 1884 to 1965 . They are commonly called Prayers after Mass. The name derives from the fact that they were introduced by Pope Leo XIII. They were slightly modified by Pope Pius X. The Holy See's 26 September 1964 Inter Oecumenici, which came into force on 7 March 1965, declared "The Leonine Prayers are suppressed".