Louisa Maria Stuart

Louisa Maria Teresa Stuart (; 28 June 1692 – 18 April 1712), known to Jacobites as The Princess Royal, was the last child of James II and VII, the deposed King of England, Scotland and Ireland, by his second wife Mary of Modena. Like her brother James Francis Edward Stuart (The Old Pretender), Louisa Maria was a Roman Catholic, which, under the Act of Settlement 1701, debarred them both from succession to the British throne after the death of their Protestant half-sister Anne, Queen of Great Britain.

A Royal Stuart Society paper calls Louisa Maria the Princess over the Water, an allusion to the informal title King over the Water of the Jacobite pretenders, none of whom had any other legitimate daughters. Provided by Wikipedia