 Calvinists differ from Lutherans (another major branch of the Reformation) on the real presence of Christ in the Eucharist, theories of worship, and the use of God's law for believers, among other things.The term "Calvinism" can be misleading, because the religious tradition which it denotes has always been diverse, with a wide range of influences rather than a single founder; however almost all of them drew heavily from the writings of Augustine of Hippo a millennium prior.In the context of the Reformation, Huldrych Zwingli began the Reformed tradition in 1519 in the city of Zürich.