St. Helena Church belongs to the Armenian Church. According to one version, the Armenians purchased this place from the Copts. Another sources pints that the site was purchased from the Georgian Church. Either way, the church was built by the Crusaders. There was once a Byzantine church that had nothing left of it after the persecution of Christians by the Arab ruler al-Hakim in the 11th century AD. This act was the official reason for the crusade. According to tradition, the ancient church led to an old reservoir in which St. Helena found the remains of the cross on which Jesus was crucified.