The calendar of saints is a traditional Christian method of organizing a liturgical year by associating each day with one or more saints and referring to the feast day of said saint. The system arose from the early Christian custom of annual commemoration of martyrs on the dates of their deaths, or birth into heaven, and is thus referred to in Latin as dies natalis ("day of birth"). In the Eastern Orthodox Church, it is called a Menologion. Menologion may also refer to a set of icons on which saints are depicted along the order of dates of their feasts, often made in two panels.

As the number of recognized saints increased during Late Antiquity and the first half of the Middle Ages, eventually every day of the year had at least one saint who was commemorated on that date. To deal with this increase, some saints were moved to alternate days in some traditions or completely removed, with the result that some saints have different feast days in different calendars. For example, Ss. 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. When the 1969 reform of the Catholic calendar moved him to 28 January, they were moved back to 7 March (see General Roman Calendar). Both days can thus be said to be their feast day, in different traditions. The Roman Catholic calendars of saints in their various forms, which list those saints celebrated in the entire church, contains only a selection of the saints for each of its days. A fuller list is found in the Roman Martyrology, and some of the saints there may be celebrated locally.

Saint Roch or Rocco (Arabic: روكز‎; Albanian: Shën Rroku; German and Latin: Rochus; Occitan: Ròc; Catalan: Roc; Italian: Rocco; French: Roch; Maltese: Rokku; Polish: Roch; Spanish, Filipino and Portuguese: Roque; Slovak: Roch or Rochus; Slovene: Rok; Croatian: Rok or Roko; Hungarian: Rókus; Greek: Ρόκκος); lived c.1348 - 15/16 August 1376/79 (traditionally c.1295 – 16 August 1327) was a Christian saint, a confessor whose death is commemorated on 16 August; he is specially invoked against the plague. He may also be called Rock in English, and has the dedication of St Rollox in Glasgow, Scotland, said to be a corruption of St Roch's Loch.

According to the research of the Belgian historian Pierre Bolle (2001), which today represents the most exhaustive work on ancient lives of the saint, Saint Roch is not properly a historical saint. The work of Bolle by using a rigorous historical methodology, has clarified which of the hagiographies were the most ancient, and which were instead simple reworkings and additions.

John the Evangelist (יוחנן Standard Hebrew Yoḥanan, Tiberian Hebrew Yôḥānān meaning "Yahweh is gracious", Greek: Εὐαγγελιστής Ἰωάννης) (c. AD 1 - c. 100)^{[citation needed][dubious – discuss]} is the conventional name for the author of the Gospel of John. Traditionally he has been identified with the author of the other Johannine works in the New Testament – the three Epistles of John and the Book of Revelation, written by a John of Patmos – as well as with John the Apostle and the Beloved Disciple mentioned in the Gospel of John. However, at least some of these connections have been debated since about 200.

The Gospel of John refers to an unnamed "Beloved Disciple" of Jesus who bore witness to the gospel's message. The composer of the Gospel of John seemed interested in maintaining the internal anonymity of the author's identity.

The apostle John was a historical figure, one of the "pillars" of the Jerusalem church after Jesus' death. Some scholars believe that John was martyred along with his brother (Acts 12:1-2), although many other scholars doubt this. Harris believes that the tradition that John lived to old age in Ephesus developed in the late 2nd century, although the tradition does appear in the last chapter of the gospel. By the late 2nd century, the tradition was held by most Christians.

Saint Francis of Assisi (born Giovanni Francesco di Bernardone; 1181/1182 – October 3, 1226) was an Italian Catholic friar and preacher. He founded the men's Franciscan Order, the women’s Order of St. Clare, and the lay Third Order of Saint Francis. St. Francis is one of the most venerated religious figures in history.

Francis was the son of a wealthy cloth merchant in Assisi, and he lived the high-spirited life typical of a wealthy young man, even fighting as a soldier for Assisi. While going off to war in 1204, Francis had a vision that directed him back to Assisi, where he lost his taste for his worldly life. On a pilgrimage to Rome, he begged with the beggars at St. Peter's. The experience moved him to live in poverty. Francis returned home, began preaching on the streets, and soon amassed a following. His order was endorsed by Pope Innocent III in 1210. He then founded the Order of Poor Clares, which was an enclosed order for women, as well as the Third Order of Brothers and Sisters of Penance. In 1219, he went to Egypt in an attempt to convert the Sultan. By this point, the Franciscan Order had grown to such an extent that its primitive organizational structure was no longer sufficient. He returned to Italy to organize the order. Once his organization was endorsed by the Pope, he withdrew increasingly from external affairs. In 1223, Francis arranged for the first Christmas manger scene. In 1224, he received the stigmata, making him the first recorded person to bear the wounds of Christ's Passion. He died in 1226 while preaching Psalm 141.

Joseph (Hebrew יוֹסֵף, "Yosef"; Greek: Ἰωσήφ) is a figure in the Gospels, the husband of the Virgin Mary and the earthly father of Jesus Christ (in distinction to God the Father, his "heavenly father"). In Roman Catholic, Eastern Orthodox and Anglican Christian traditions he is regarded as Saint Joseph.

The Pauline epistles, generally considered the earliest extant Christian records, make no reference to Jesus' father; nor does the Gospel of Mark, generally considered the first of the gospels. The first appearance of Joseph is therefore in the gospels of Matthew and Luke. Each contains a genealogy of Jesus tracing his ancestry back to King David, but the two are from different sons of David; Matthew follows the major royal line from Solomon, while Luke follows a minor line from Nathan, another son of David and Bathsheba. Consequently all the names between David and Joseph are different. According to Matthew "Jacob was the father of Joseph," while according to Luke, Joseph, or possibly Jesus, is said to be "of Heli." Some scholars reconcile the genealogies by viewing the Solomonic lineage as Joseph's major royal line, and the Nathanic lineage in Luke to be Mary's minor line.