Mosaic of one of the earliest known images of Christ. Neil MacGregor, Director of the British Museum, looks at this mosaic which was made somewhere around the year 350 and was found on the floor of a Roman villa in Dorset. He explores what the object's survival says about the state of Christianity at this time and what sort of Christ was imagined in Roman Britain. Historians Dame Averil Cameron and Eamon Duffy help paint the picture. (Duration: 14 mins)