 Most feasts of the Apostles also had vigils, namely Saints Andrew, Thomas, James, Simon and Jude.Whilst the vigils of the Immaculate Conception, Saints Peter and Paul, Saint Lawrence, Saint Bartholomew and Saint Matthew remained, they soon came to be impeded by higher-ranking feasts added to the calendar, and they were instead commemorated as part of other Masses rather than observed in their own right.The Vigil of St. Matthias was unique, in that it was normally commemorated on 23 February, the feast of St. Peter Damian, but in leap years was kept on 24 February, the leap day of the Roman calendar.