The calendar of saints is a traditional Christian method of organizing a liturgical year by associating each day with one or moresaints 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. 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.