"The Black Seal" is the sixth and final episode of The Black Adder, the first serial in the BBC Television Blackadder series. Set in late 15th-century England, the episode concludes the alternative history of the last years of the House of York with the final adventure of Prince Edmund, Duke of Edinburgh, son of the fictional King Richard IV. The story follows a conspiracy by Edmund to overthrow the King and seize the Throne of England for himself, assisted by a band of violent mercenaries.