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Prince Rupert of the Rhine was the leader of an 18,000-man strong army that fought against Oliver Cromwell at Marston Moor in the English Civil War. He was soundly defeated. (PROSE: Nightshade)
Behind the scenes
Mark Gatiss did not call Prince Rupert "Prince Rupert of the Rhine" explicitly — perhaps because that's such an obvious fact of English history. However, Prince Rupert is quite sufficient to identify him.