Chapel of Saint Helena, Jerusalem
East Jerusalem, Palestine
The Chapel of Saint Helena is a 12th-century Armenian church in the lower level of the Church of the Holy Sepulchre in Jerusalem, constructed during the Kingdom of Jerusalem. The Armenians call it the Chapel of St. Gregory the Illuminator, after the saint who brought Christianity to the Armenians.
Church data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).