The Relics of the Passion at Santa Croce in Gerusalemme (Rome)

This is the Basilica di Santa Croce in Gerusalemme's own custodial record, maintained by the church's rectory in Rome and published on its own website, for the relics of the Passion the basilica holds, a collection traditionally associated with Helena, mother of the emperor Constantine. Its strength is that a holding institution's own custodial record is the correct primary source for what the church holds and how it presents that holding today. Its limit is exactly what a custodial record cannot supply: it is not a scholarly study of the relics' actual origin or authenticity, questions on which independent historians take a considerably more skeptical view than a devotional institution's own presentation does, so a claim about the relics' documented history before their arrival at the basilica needs an independent historical source rather than this record alone.