The article features the Victoria's Motet "O decus apostolicum." The motet is performed on the Sunday after Easter, the gospel reading focusing on the apostle Thomas who expressed his doubt with regard to news of Christ's resurrection. The tradition of the liturgy does not produce a text for the motet but appears in antiphonaries beginning in the 11th century. First printed in 1572, the text includes the alleluia, which is a deviation from the O antiphon.