The Duchess of Sussex was pregnant when she stood in front of the altar. And she was in love — not with her husband-to-be but her cousin. No, not Meghan, obviously — but the last woman to bear the title Duchess of Sussex. More than 200 years ago, a red-headed royal prince fell in love with a dark-haired older woman. What followed was a web of love, lies, deceit and royal disgrace which was to last 40 years. She was Lady Augusta Murray, daughter of the Earl of Dunmore. He was Prince Augustus Frederick, sixth son of 'mad' King George...