Tour de Nesle affair
The Tour de Nesle affair was a scandal amongst the French royal family in 1314, during which Margaret, Blanche, and Joan, the daughters-in-law of King Philip IV, were accused of adultery. The accusations were apparently started by Philip's daughter, Isabella. The "Tour de Nesle" was a tower in Paris where much of the adultery was said to have occurred. The scandal led to torture, executions and imprisonments for the princesses' lovers and the imprisonment of the princesses, with lasting consequences for the final years of the House of Capet.