St. Helena discovering the True Cross of Jesus's crucifixion during a pilgrimage to the Roman province of Syria Palaestina in the 4th century. After a Greek MS of the 9th century in the National Library, Paris. Saint Helena or Saint Helen, c.?250  c.?330. Consort of the Roman emperor Constantius Chlorus and the mother of the emperor Constantine the Great. From Cassell's History of England, published c.1901