This is so fucking retarded. You honestly think some 800 year old contract carries weight? The church waged war on the British over this nonsense via the Spanish. The church and the Spanish lost. They wanted Mary Queen of Scots elevated to the throne because she was Catholic. About a hundred years later Catholics retook the throne for a brief period with the elevation of James II (VII of Scotland) but he was deposed in the glorious revolution of 1688. This led to a series of sectarian conflicts for control of the crown over the subsequent 60 years, known as the Jacobite rebellions or less commonly the confederate wars. The Jacobites were vanquished in 1745 leaving Charles III, a Protestant, on the throne and the British crown has remained Protestant since then. The orange march/walk that occurs on 12 July every year in Ireland and Scotland carry banners proclaiming their loyalty to the crown only so long as the crown remains Protestant, and up until quite recently British royals were prohibited from marrying Catholics. Contracts are not very important. Weapons and blood are important. And the little discussions and disagreements we have over religion in these isles are very rarely settled with anything other than weapons and blood. If a pope went down your little rabbit hole and tried to claim the British crown on the basis of a contract he wouldn’t be met with litigation, he would be met with weapons and blood. The British crown is Protestant until someone is willing to take it from the Protestants by force. Civil law just won’t cut it.