Spear of Destiny.

Challenged, Peter offered to undergo ordeal by fire to prove that he was divinely guided. Being in Biblical lands, they chose a Biblical ordeal: Peter would pass through a fiery furnace and would be protected by an angel of God. The crusaders constructed a path between walls of flame; Peter would walk down the path between the flames. He did so, and was horribly burned. He died after suffering in agony for twelve days. There was no more said about the Holy Lance, although one faction continued to hold that Peter was genuine and that this was indeed the true Lance.

Forrás: Wikipedia — Siege of Antioch.
(Also: Sacred Destinations — Antioch.)