The Apostle Peter was jailed in Jerusalem, shackled in an iron chain for preaching about Jesus. The night before his trial, St. Peter was said to have been released from the chain by an angel and led out of the prison. Today, the chain is housed in a reliquary under the main altar in the San Pietro in Vincoli (Saint Peter in Chains) basilica in Rome. Legend says that when the Empress Eudoxia gave the chain to Pope Leo I, he held them next to the chains from Peter's first imprisonment in the Mamertime Prison in Rome and the two chains miraculously fused together.