Meskel is an Ethiopian and Eritrean Orthodox Tewahedo Church holiday that commemorates the discovery of the True Cross by the Roman Empress Saint Helena of Constantinople in the fourth century. Meskel is celebrated by Oriental Orthodox members of the Ethiopian Orthodox Tewahedo Church, the Eritrean Orthodox Tewahedo Church, and to a lesser extent Roman Catholic members of the Ethiopian Catholic Church, the Eritrean Catholic Church, and among Protestant members of P'ent'ay - Ethiopian-Eritrean Evangelicalism. It is a localized version of the Feast of the Cross and occurs on the 17 Meskerem in the Ethiopian calendar. "Meskel" is Amharic for "cross".
The Ethiopian Orthodox Tewahedo Church is the largest of the Oriental Orthodox Churches. One of the few Christian churches in Africa originating before European colonization of the continent, the Ethiopian Orthodox Tewahedo Church dates back to the Christianization of the Kingdom of Aksum in 330, and has between 36 million and 51 million adherents in Ethiopia. It is a founding member of the World Council of Churches. The Ethiopian Orthodox Tewahedo Church is in communion with the other Oriental Orthodox churches.
The Eritrean Orthodox Tewahedo Church is one of the Oriental Orthodox Churches with its headquarters in Asmara, Eritrea. It was given autocephaly by Shenouda III of Alexandria, pope of the Coptic Orthodox Church, after Eritrea gained its independence from Ethiopia in 1993. Thus, the Eritrean Church accords a primacy of honor to the Coptic Church.
The Julian calendar is a solar calendar of 365 days in every year with an additional leap day every fourth year. The Julian calendar is still used as a religious calendar in parts of the Eastern Orthodox Church and in parts of Oriental Orthodoxy as well as by the Amazigh people. For a quick calculation, between 1901 and 2099 the much more common Gregorian date equals the Julian date plus 13 days.