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| 28 | c | St. Guntram original: "s. Gontran"; a 6th-century King of Burgundy known for his piety and for founding monasteries. |
| 29 | d | St. Cyril original: "s. Cirille"; likely referring to Cyril of Jerusalem or Cyril of Heliopolis. |
| 30 | e | St. Pastor original: "s. Paſter"; a name shared by several early martyrs and a priest in Rome. |
| 31 | f | St. Amos original: "s. Amos"; one of the twelve minor prophets of the Old Testament. |
April has 30 days, and the lunar cycle has 29. The note on the moon refers to the "lunar month," a calculation used to determine the date of Easter and other movable feasts.
| 1 | g | St. Theodore original: "s. Théodore"; likely St. Theodore of Sion. |
| 2 | A | St. Nicetius original: "s. Nizier"; the 6th-century Bishop of Lyon known for his austerity and care for the poor. |
| 3 | b | St. Ambrose original: "s. Ambroiſe"; usually celebrated on December 7, but often appearing here in older calendars marking his death date or a translation of relics. |
| 4 | c | St. Azad original: "s. Azade"; a Persian martyr and eunuch at the court of King Shapur II. |
| 5 | d | St. Vincent original: "s. Vincent"; St. Vincent Ferrer, a Dominican friar and famous preacher. |
| 6 | e | St. Athanasius original: "s. Athanp"; likely an abbreviation for Athanasius. |
| 7 | f | St. Hegesippus original: "s. Egeſippe"; a 2nd-century Christian writer and chronicler of early Church history. |
| 8 | g | St. Perpetua original: "ste. Perpetüe"; though usually paired with Felicity in March, she is commemorated here in this specific calendar tradition. |
| 9 | A | St. Mary of Egypt original: "ste. M. Eg."; a desert ascetic who lived a life of penance in the wilderness after a colorful early life. |
| 10 | b. | St. Ezekiel original: "s. Ezech."; the major Old Testament prophet. |
| 11 | c | St. Leo original: "s. Leon"; Pope Leo I, known as "the Great," who famously met Attila the Hun. |
| 12 | d | St. Zeno original: "s. Zenon"; Bishop of Verona and martyr. |
| 13 | e | St. Justin original: "s. Juſtin"; St. Justin Martyr, an early Christian apologist. |
| 14 | f | St. Tiburtius original: "s. Tiburce"; a Roman martyr often associated with Saints Valerian and Maximus. |
| 15 | g | St. Coissan original: "s. Coiſſan"; likely a local variant of St. Crescent or a specific regional saint. |
| 16 | A | St. Paternus original: "s. Pare"; also known as St. Pair, a 6th-century Bishop of Avranches. |
| 17 | b | St. Anicetus original: "s. Anicet"; an early Pope and martyr. |
| 18 | c | St. Juvinus original: "s. Jubin"; a local saint popular in the Champagne and Rheims regions of France. |