(2) The Constitution for Scotland states that the monarch would hold title under the law of Scotland, so presumably the Parliament of Scotland could, at some future time, alter the law of succession in such a way that this personal union is dissolved.
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A Scottish Parliament would also be able, if it so desired at some future time, to remove the religious proscriptions which ban Roman Catholics from inheriting the Crown under the Act of Settlement.
The restoration of Charles II was not without incident, and with the Act of Settlement came the Jacobite Risings, to which Perth was supportive.
This means, for example, that any change to the Act of Settlement's provisions barring Roman Catholics from the throne or giving male heirs precedence over females would require the unanimous consent of the parliaments or governments (depending on the wording of each constitution) of all the other Commonwealth realms if the unity of the Crown is to be retained.
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An example of the latter is the granting of English nationality to the Electress Sophia of Hanover, the heir to the throne under the Act of Settlement 1701.
Many refugees from the French Revolution settled in Brighton after escaping from France; and Maria Fitzherbert, a twice-widowed Catholic, began a relationship with the Prince Regent (and secretly married him in 1785 in a ceremony which was illegal according to the Act of Settlement 1701 and the Royal Marriages Act 1772).