Discovery of the Body of Saint Mark
In 1642, His Holiness Pope Urban VIII issued the papal bull Universa Per Orbem which mandated the required Holy Days of Obligation for the Universal Church to consist of 34 days as well as the principal patrons of one’s one locality (e.g. city and country). Those days were the Nativity of Our Lord, the Circumcision of Our Lord, the Epiphany of Our Lord, Monday within the Octave of the Resurrection, Tuesday within the Octave of the Resurrection, Ascension Thursday, Monday within the Octave of Pentecost, Tuesday within the Octave of Pentecost, Most Holy Trinity, Corpus Christi, the Finding of the Holy Cross, the Purification of the Blessed Virgin Mary, the Annunciation of the Blessed Virgin Mary, the Assumption of the Blessed Virgin Mary, the Nativity of the Blessed Virgin Mary, the Dedication of St. Michael, the Nativity of St. John the Baptist, SS. Peter and Paul, St. Andrew, St. James, St. John (the December feast day), St. Thomas, SS. Philip and James, St. Bartholomew, St. Matthew, SS. Simon and Jude, St. Matthias, St. Stephen the First Martyr (the December feast day), the Holy Innocents, St. Lawrence, St. Sylvester, St. Joseph, St. Anne, and All Saints.
Ultimately Universa Per Orbem helped bring more uniformity to the Church since some parts of the Catholic world observed even more holy days of double precept (i.e., mandatory attendance at Mass and rest from servile work). One of those former days which kept in some places as the Feast of St. Mark the Evangelist.
For instance, in modern-day Texas, New Mexico, Arizona, and California, which were included in the ecclesiastical province of Mexico, the feasts were regulated by the Third Council of Mexico in 1585, as American Catholic Quarterly Review states:
« In these parts besides those already mentioned, the faithful observed as holy days of obligation St Fabian and St Sebastian (January 20th), St Thomas Aquinas (March 7th), St Mark (April 25th), St Barnabas (June 1), the Visitation of the Blessed Virgin (July 2), St Mary Magdalene (July 22), St Dominic (Aug 4), the Transfiguration (Aug 6), St Francis (Oct 4), St Luke (Oct 18), St Catharine (Nov 25), the Expectation of the Blessed Virgin (Dec 18).