Robert the Devil, the hero of an old French romance identified with Robert, first Duke of Normandy, who, after a career of cruelty and crime, repented and became a Christian, but had to expiate his guilt by wandering as a ghost over the earth till the day of judgment; he is the subject of an opera composed by Meyerbeer.
Definition taken from The Nuttall Encyclopædia, edited by the Reverend James Wood (1907)
Robert III. * Roberts, David