The Hieromartyr Cyriacus, Patriarch of Jerusalem, was a Jew who pointed out to the holy Empress Helen the place where the Life-Creating Cross of Christ lay buried (September 14). Being present at the discovery of the Cross, Cyriacus (before Baptism he was named Jude) sincerely came to believe in Christ the true God, and he became a Christian. Cyriacus, because of his pure and virtuous life, was later chosen to be Patriarch of Jerusalem. He suffered martyrdom under the emperor Julian.
During the cruel persecution under Julian the Apostate, in the year 363, Saint Cyriacus accepted suffering for the Faith. He was killed after prolonged tortures.