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The mystical marriage of Saint Catherine covers two different subjects in Christian art arising from visions received by either Catherine of Alexandria or Catherine of Siena , in which these virgin saints went through a mystical marriage wedding ceremony with Christ, in the presence of the Virgin Mary, consecrating themselves and their virginity to him.
The Catholic Encyclopaedia notes that such a wedding ceremony "is but the accompaniment and symbol of a purely spiritual grace", and that "as a wife should share in the life of her husband, and as Christ suffered for the redemption of mankind, the mystical spouse enters into a more intimate participation in His sufferings." Catherine of Alexandria was martyred, while Catherine of Siena received the stigmata.
Both subjects are frequent subjects in Christian art; the scene usually includes one of the Saint Catherines and either the infant Jesus held by his mother or an adult Jesus. Very rarely both saints are shown in a double ceremony. Saint Catherine of Alexandria is invariably dressed as a princess in rich clothes, often with a crown, and normally with loose long blonde hair and carrying a martyr's palm, sometimes with her attribute of a wheel; Saint Catherine of Siena is shown as a Dominican nun in white with a black over-robe open at the front, so it is usually easy to tell which saint is depicted.