The Fireball of Christ

You may be aware that part of what caused the pagan emperor Constantine to pass the Edict of Milan (313) that legalized Christianity was seeing a sign in the sky after a dream of Jesus Christ saying, "In this sign, conquer."  He instructed his soldiers to put the letters for Jesus Christ on their shields before going into battle.  The Fireball of Christ is a National Geographic special about what some think is a fourth century meteor crater in central Italy that could explain the fire in the sky which in some stony meteor entries, does resemble a cross.  There are also local legends that fit the meteor re-entry explanation.