A Triduum Greeting to Remnant Readers Vexilla regis prodeunt, fulget crucis mysterium: The insignia of the King advance, the Mystery of the Cross shines forth. These are the words of the hymn which we have sung during the moving liturgical celebration of Good Friday, when the Blessed Sacrament is carried from the Sepulcher to the altar for the Communion of the priest. And these same solemn words were adopted in 1793 as the hymn of the Vendéean Army during the heroic Catholic uprising against the French Revolution.