The Reformed churches are a group of Christian Protestant denominations that are historically related by a doctrine that is identical or similar to Calvinism. It developed in the Swiss Reformation led by Huldrych Zwingli and John Calvin, but soon afterwards appeared in nations throughout Western Europe. Each nation in which the Reformed movement was originally established had its own church government. Several of these local churches have expanded to worldwide denominations and most have experienced schisms into multiple denominations. 