Columbia subject headings:
Constantine I, Emperor of Rome, -337--Legends.
Helena, Saint, approximately 255-approximately 330--Legends.
Harvard subject headings:
Christian women saints--Biography
Constantine I, Emperor of Rome, -337--Legends.
Emperors--Rome--Biography
Helena, Saint, approximately 255-approximately 330--Legends.
Rome--Biography.
Rome--History--Constantine I, the Great, 306-337.
Princeton subject headings:
Constantine I, Emperor of Rome, -337.
Emperors--Rome--Biography--Childhood and youth.
Helena, Saint, approximately 255-approximately 330.