I just finished 'Grace' by Robert Lacey. Apparently Charlotte was the illegitimate daughter of Prince Louis and a washerwoman's daughter when Prince Louis was station in Algiers(?). I don't think Prince Louis married or had other heirs and so Charlotte was made legit. She married Prince Pierre de Polignac who changed his name to Grimaldi. I think it might have been an arranged marriage because it certainly was an unhappy one. The two wound up in a ugly quarrel during Ranier and Grace's wedding festivities over the some missing jewels, and Charlotte's chauffer/companion at the time was a known jewel thief. Charlotte disliked Grace immensely, thinking Ranier had married beneath him, and never returned to Monaco after their wedding. I don't think she ever inherited the throne though, I think it passed from her father to her son (grandfather to grandson).
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