The list of calendar events for a month

• Kalendarium de Carmona (VI cent.)
• Antiphonarium Legionense (X cent. med.)
• Kalendarium Cordubensis (961)
• Codex Vigilanus seu Albeldensis (975)
• Codex Aemilianensis (994)
• Kalendarium de Ripolli (X cent. ex.)
• Liber ordinum sacerdotal (X cent. ex.)
• Liber ordinum episcopal (1052)
• Liber horarum (1055)
• Liber commicus (1067)
• Etymologiarum cum kalendario (1072)
• Missale cum kalendario, fragm. I (XI ex.)
• Kalendarium Mozarabicum, fragm. II
• Santoral de Saint-Michel de Cuxa (XII cent. med.)
• Missale Mixtum (1500)
• Breviarium Gothicum (1502)
• Kalendarium Gothicum (1775)

April (Julian) April (Gregorian)
1	KAL APLS		14
2	IIII NNS		15
3	III	Theodosie Martyris	16
4	II	Ambrosii Episcopi; Isidori Confessoris	17
5	NNS		18
6	VIII IDS		19
7	VII		20
8	VI		21
9	V	Fructuosi Episcopi Bracharensis; Toribii Confessoris	22
10	IIII	Eleutherei Episcopi et Martyris	23
11	III		24
12	II	Victoris Bracharensis Martyris	25
13	IDS	Eufimie Virginis et Martyris	26
14	XVIII KAL MDS	Tiburtii et Valeriani Martyrum	27
15	XVII		28
16	XVI		29
17	XV		30
May (Gregorian)
18	XIIII		1
19	XIII		2
20	XII		3
21	XI	Vitalis Martyris	4
22	X		5
23	VIIII	Georgii Martyris; Felicis et Fortunati Martyris	6
24	VIII	Sancti Proficii Martyris	7
25	VII	Marci Evangeliste	8
26	VI	Cleti Martyris; Marcelli et Petri	9
27	V	Sancti Georgii Martyris	10
28	IIII	Vitalis Martyris	11
29	III	Petri Martyris Ordinis Predicatorum	12
30	II	Eutropii Episcopi et Martyris	13