While some consorts to thrones such as King Phillip (to Mary I of England) or King William III (to Mary II of England, though he had birthright as well) ruled a country by rights of marriage (jure uxoris), a crown matrimonial was taken to a more drastic step. It (theoretically) ensured that a Queen’s husband would remain King after her own death even if no heirs are produced, and that future heirs by a different wife would become the new monarch eventually. Mary, Queen of Scots faced this hypothetical question twice with her first husband King Francis II of France and her second husband Lord Darnley, though she outlived them both.