Trier Cathedral is a repository of Christian shrines. The altar contains the tunic of the Lord, in the crypt there is a reliquary with the head of St. Helena, and in the sacristy there is part of the chain with which the Apostle Peter was bound, a strap from the sandal of St. Andrew the First-Called, as well as particles of the relics of the holy righteous fathers Joachim and Anna. Also some of the bishops of Trier are buried in the cathedral.