It is believed by some that even from
Apostolic Age, private Mass was celebrated whenever convenient. Be this as it may, it is certain that in the first years of Christianity, public Masses were offered on Sundays only and later on Wednesdays and Fridays also. To these three days Saturday was added, especially in the East.
Augustine of Hippo, who died in 430, assures us that while, in his time, Mass was celebrated only on Sundays in some places, in others on Saturdays and Sundays, it was nevertheless in many places customary to have the Holy Sacrifice daily, in Spain, in Northern Italy, in
Constantinople, as well as elsewhere. Daily Mass became universal about the close of the sixth century. It was not long before priests began to celebrate the Holy Sacrifice two, three or more times daily, according to their own desire, until canons imposed a limit.
Pope Alexander II (d. 1073) decreed that a priest should be content with saying Mass once a day, unless it should be necessary to offer a second - never more - for the dead. Notwithstanding this legislation, the practice continued of celebrating more often on some of the greater feasts: thus on 1 January one Mass was said of the
Octave of the Nativity of Christ, another in honour of the Blessed Virgin; three Masses were said by bishops on
Holy Thursday, in one of which sinners were reconciled to the Church, a second for the Consecration of the Oils, and a third in keeping with the feast; two Masses were said on the Vigil of the
Ascension, as well as on the feast itself; three Masses were celebrated on Easter, and three also on the
Nativity of Saint John the Baptist. On the
feast of Sts. Peter and Paul the pope said one Mass in the
basilica of St. Peter and a second in that of
St. Paul Outside-the-Walls. Finally, abolishing all these customs,
Pope Innocent III (d. 1216) prescribed that a simple priest should say but one Mass daily, except on Christmas, when he might offer the Holy Sacrifice three times; while
Pope Honorius III (d. 1227) extended this legislation to all dignitaries. This then is the discipline of both the Eastern and Western Churches. ==Exceptions==