This reliquary in the form of a diptych showing the Nativity of Christ and his Crucifixion is one of a small group of related objects produced in a workshop in Assisi, Umbria, associated with the Franciscan father Pietro Teutonico. The object is intended for private devotional use and would have served as a souvenir of a pilgrimage to the Franciscan shrines at Assisi. The coats of arms presumably represent the patron who commissioned the object. The verre églomisé technique involves painting on the reverse side of the glass and is intended to emulate the effect of more expensive enamel work.