Calendar of saints

The word "feast" in this context does not mean "a large meal, typically a celebratory one", but instead "an annual religious celebration, a day dedicated to a particular saint".

[2] "Menologion" may also mean a set of icons on which saints are depicted in the order of the dates of their feasts, often made in two panels.

For example, saints Perpetua and Felicity died on 7 March, but this date was later assigned to St. Thomas Aquinas, allowing them only a commemoration (see Tridentine calendar), so in 1908 they were moved one day earlier.

A broader range of titles was used later, such as Virgin, Pastor, Bishop, Monk, Priest, Founder, Abbot, Apostle, and Doctor of the Church.

The present Roman Missal has common formulas for the Dedication of Churches, the Blessed Virgin Mary, Martyrs (with special formulas for missionary martyrs and virgin martyrs), pastors (subdivided into bishops, generic pastors, founders of churches, and missionaries), Doctors of the Church, Virgins, and (generic) Saints (with special formulas for abbots, monks, nuns, religious, those noted for works of mercy, educators, and [generically] women saints).

This calendar system, when combined with major church festivals and movable and immovable feasts, constructs a very human and personalised yet often localized way of organizing the year and identifying dates.

Those who use even earlier forms of the Roman Rite rank feast days as doubles (of three or four kinds), Semidoubles, and Simples.

Before the advent of standardized naming of tropical storms and hurricanes in the North Atlantic basin, tropical storms and hurricanes that affected the island of Puerto Rico were informally named after the Catholic saints corresponding to the feast days when the cyclones either made landfall or started to seriously affect the island.

A medieval manuscript fragment of Finnish origin, c. 1340 –1360, utilized by the Dominican convent at Turku , showing the liturgical calendar for the month of June
A Welsh calendar of saints' days, c. 1488–1498
Excerpt from the Irish Feastology of Oengus , presenting the entries for 1 and 2 January in the form of quatrains of four six-syllabic lines for each day. In this 16th-century copy (MS G10 at the National Library of Ireland ) we find pairs of two six-syllabic lines combined into bold lines, amended by glosses and notes that were added by later authors.