As jacalata said, it's the Church of England, the Anglican Church. If you're American, you might be more familiar with the word Episcopalian, which is the Ameri

As jacalata said, it's the Church of England, the Anglican Church. If you're American, you might be more familiar with the word Episcopalian, which is the American branch of the Anglican Communion, a community of Anglican Churches in various countries around the world. Historically, England (and I'm talking about England here, not Scotland, which has a different arrangement) was a Catholic country, until the Pope wouldn't give Henry VIII a divorce. He created the Church of England with himself as its head. Anglicanism is a broad church with some congregations that are basically similar to Catholicism (outside of the Roman Catholic church) with the ritual and ceremony — High Church congregations — and some which which are Protestant. The Queen is the head of the Church of England, and the Archbishop of Canterbury is the senior priest. Senior members of the Church of England have the right to sit the the House of Lords, which is the second chamber of the British Parliament, so as you can see, the Church, the Monarchy (which is nominally the executive), and the legislature are all tied together — that's what it means to have an established church. edit: messed up the Roman numerals