Supreme Head of the Church of England church's assets in England and declared the Church of England as the established church with himself as its head. Henry's daughter, Queen Mary I, a staunch Catholic, attempted to restore the English church's allegiance to the Pope and repealed the Act of Supremacy in 1555. Her half-sister, the Protestant Elizabeth I, took the throne in 1558 and the next year, Parliament passed the Act of Supremacy of 1559 that restored the original act. The new Oath of Supremacy that nobles were required to swear gave the Queen's title as "Supreme Governor" of the church rather than "Supreme Head", to avoid
Oath of Supremacy counsellors, Sir Stephen Rice and Justin McCarthy, Viscount Mountcashel. The centrality of the Oath was re-established under the reign of William III and Mary II. Oath of Supremacy The Oath of Supremacy required any person taking public or church office in England to swear allegiance to the monarch as Supreme Governor of the Church of England. Failure to do so was to be treated as treasonable. The Oath of Supremacy was originally imposed by King Henry VIII of England through the Act of Supremacy 1534, but repealed by his daughter, Queen Mary I of England and reinstated under Mary's half-sister,