This disposition changed dramatically when the Acts of Union 1707 came into force, with a single unified Crown of Great Britain and a single unified parliament. Ireland remained formally separate, with its own parliament, until the Acts of Union 1800. The Union of 1707 provided for a Protestant-only succession to the throne in accordance with the English Act of Settlement of 1701; rather than Scotland's Act of Security of 1704 and the Act anent Peace and War 1703, which ceased to have effect by the Repeal of Certain Scotch Acts 1707. The Act of Settlement required that the heir to the English throne be a descendant of the Electress Sophia of Hanover and not be a Roman Catholic; this brought about the Hanoverian succession of George I in 1714.