Matilda Wisely

Younger daughter of Robert 'the Breton', Duke of Cornwall. She was born twenty years after her next oldest sibling, Humphrey Wisely, thus making her an age peer with her nephew and future husband Robert II, Duke of Cornwall. That doesn't make it not weird, though. There are questions as to the paternity of her eldest daughter, Cecilia, with some speculating that there was some element of a hastily planned cover-up, especially considering the fact that the marriage and Cecilia's birth both happened in the same year.