An army of mail-clad horsemen arriving to contend the battlefield just as the invaders seemed to have victory in their grasp. A king armed with a sacred weapon, laying claim to an empty imperial throne. In 2003, a film of The Lord of the Rings had brought Aragorn’s victory over the snarling hordes of Mordor to millions who had never heard of the battle of the Lech. Burnished and repackaged for the twenty-first century, Otto’s defence of Christendom still possessed a spectral glamour.
