The Ethiopian Orthodox Tewahedo Church also claims to have the right wing of the true cross buried in the monastery of Gishen Mariam. The Ethiopian Orthodox Tewahedo Church has an annual religious holiday, called Meskel or Demera, commemorating the discovery of the True Cross by Queen Helena. Meskel occurs on 17 Meskerem in the Ethiopian calendar (September 27, Gregorian calendar, or September 28 in leap years).