For more than 1,500 years Catholics have made pilgrimage to Rome's Santi Apostoli Church to venerate two apostles, St. Philip and St. James the Younger - who is said to have been Jesus' brother.

The limestone box, or ossuary, features the inscription 'James, son of Joseph, brother of Jesus,' written in ancient Aramaic. Because the names correspond to those of Jesus of Nazareth's brother ...