Chapel of Saint Helena - Credit: Wikimedia Commons
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,List of Christians in the Holy Land, Documenta Catholica Omnia, p. 87. after the saint who brought Christianity to the Armenians. Read more on Wikipedia
Source: en.wikipedia.org