any of several major representative groups of classical Protestantism (Protestant Heritage) that arose in the 16th-century Reformation. Originally, all of the Reformation churches used this name (or the name Evangelical) to distinguish themselves from the “unreformed,” or unchanged, Roman Catholic church. After the great controversy among these churches over the Lord's Supper (after 1529), the followers of Martin Luther (Luther, Martin) began to use the name Lutheran as a specific name, and the name Reformed became associated with the Calvinistic (Calvinism) churches (and also for a time with the Church of England (England, Church of)). Eventually the name Presbyterian, which denotes the form of church polity used by most of the Reformed churches, was adopted by the Calvinistic churches of British background. The modern Reformed churches thus trace their origins to the Continental Calvinistic churches that retained the original designation. The Reformed and Presbyterian churches are treated jointly in the article Reformed and Presbyterian churches.