Era of the Martyrs

The epoch of the Coptic calendar, counted from 284 CE, the year of Diocletian’s accession and the beginning of imperial persecution of Christians.

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Coptic calendar: A solar calendar used by the Coptic Orthodox Church and for agricultural dates in Egypt, with twelve 30-day months and a short final month. The Era of the Martyrs is the epoch from which this calendar numbers its years.
Diocletian: Roman emperor from 284 to 305 CE who reorganized imperial government and initiated the Great Persecution of Christians. His accession in 284 CE supplies the era’s conventional starting point.
Coptic Orthodox Church: An Oriental Orthodox church rooted in Egypt, with its own liturgy, hierarchy, and calendar. Its liturgical year continues to count time from the Era of the Martyrs.
Great Persecution: The empire-wide persecution of Christians ordered under Diocletian and his colleagues beginning in 303 CE. It began nineteen years after the calendar’s epoch, so the two dates should not be conflated.
Anno Domini: The year-numbering system that counts years from the traditionally calculated birth of Jesus. Comparing its epoch with the Coptic epoch clarifies why Coptic dates carry different year numbers.
Diocletianic Persecution: The Roman Empire’s final major persecution of Christians, initiated under Diocletian in 303 CE. The era’s name recalls the persecution that made Diocletian’s reign a defining memory.
Coptic saints: Christians recognized for holiness and venerated in Coptic tradition, including many martyrs of Roman-era Egypt. Their commemorations keep the persecution-era memory present in the church calendar.
Coptic calendar and Gregorian calendar: A comparison of the Coptic and Gregorian calendars, which use different structures and year-numbering conventions. Their year labels differ because the Coptic calendar counts from 284 CE.
Julian calendar: A solar calendar introduced by Julius Caesar in 46 BCE, with a leap day every four years. The Coptic calendar inherits its month structure and leap-year rhythm from this calendar.
Roman Egypt: The province of Egypt under Roman rule from 30 BCE until the Arab conquest in the seventh century. The era arose within the Egyptian Christian community under Roman imperial authority.