Reformed Christianity, also called Calvinism, is a major branch of Protestantism that began during the sixteenth-century Protestant Reformation, a schism in the Western Church. Today, it is largely represented by the Continental, Presbyterian, and Congregational traditions, as well as parts of the Anglican and Baptist traditions.

A foundational event that divided the Reformed from the Lutheran tradition occurred in 1529 when reformer Huldrych Zwingli of Zürich broke with Martin Luther on the topic of the Lord's Supper. A separate Reformed tradition developed over several generations, especially in Switzerland, France, Scotland and the Netherlands.

In the seventeenth century, Jacobus Arminius and the Remonstrants were expelled from the Dutch Reformed Church over disputes regarding predestination and salvation, and from that time Arminians are usually considered to be a distinct tradition from the Reformed. This dispute produced the Canons of Dort, the basis for the "doctrines of grace" or "five points" of Calvinism.

Reformed theology emphasizes the authority of the Bible, the sovereignty of God, and covenant theology, a framework for understanding the Bible based on God's covenants with people. Reformed churches have emphasized simplicity in worship. Several forms of ecclesiastical polity are exercised by Reformed churches, including presbyterian, congregational, and some episcopal. (Full article...)