In Excalibur (1981) and the Prince Valiant sunday comic, Mordred was the creepy kid with the gold mask. In Arthurian legend, Mordred and Arthur's knights met on the Field of Camlann to negotiate, which was going well until a snake bit someone, who drew his sword, as did everyone, and everyone died.
The final chapters of Tom Clancy's Sum of All Fears are Field of Calman, Asp and Sword, and Revenge of Moedred. When the crisis is over, the President settles for nuking the next likely suspect, Iran, but the chain of command is dead on down to Jack Ryan, who refuses to read his launch codes. So in a clever twist, the US president and not the Soviet president is Mordred.
When I joined the Raven I did not know the forthcoming movie would omit this element, or that the Indy 4 would provide a fitting icon, or that so many mods would bear the names of villains and I would be among them.