Institutional
Anti-Catholicism in the United Kingdom has its origins in the
English and
Irish Reformations under King
Henry VIII and the
Scottish Reformation led by
John Knox. The
Act of Supremacy 1534 declared the English crown to be 'the only supreme head on earth of the Church in England' in place of the pope. Any act of allegiance to the latter was considered treasonous because the papacy claimed both spiritual and political power over its followers. The Scottish Reformation in 1560 abolished Catholic ecclesiastical structures and rendered Catholic practice illegal in Scotland. Today, anti-Catholicism is common in peripheral areas of the
United Kingdom, mainly Scotland and
Northern Ireland.