Anglicanism is a denomination of the Protestant branch of Western Christianity that is independent from the Holy See but is in full communion with the See of Canterbury. It has an episcopal polity. While rejecting the primacy of the Bishop of Rome, it considers itself to be Catholic because it is in possession of a continuous tradition of faith and practice, based on scripture and early traditions, enshrined in the Catholic creeds, together with the sacraments and apostolic ministry. Anglicanism also considers itself to be Protestant, or Reformed, since it opposes doctrines and ways of worshipping that it considers contrary to scripture and which led to the Reformation. The mother church of those that adhere to Anglicanism is the Church of England, the churches with the largest numbers of worshippers are the Church of Nigeria, the  Church of Uganda and the Anglican Church of Kenya. The word Anglican originates in ecclesia anglicana, a medieval Latin phrase dating to at least 1246 that means the English Church. Adherents of Anglicanism are called Anglicans.