people were familiar with the horrors of roman crucifixion. >> the cross is an instrument of capital punishment. and it's quite amazing. it's one of the big stories of early christianity that the instrument of the execution and torture of jesus christ, over time, becomes the primary symbol of jesus christ. >> one of the key factors in the change is helena's pilgrimage to find the true cross. it changes the cross to something that actually becomes something tangible that people want to think about as part of their devotion. >> as fragments spread around the world, they will also help turn christianity from an