These Protestant members of the Reformed tradition developed in the 16th century from the doctrines of the Calvinist churches in Switzerland and France. In the U.S., there are two major Presbyterian bodies – the Presbyterian Church (USA) and the more conservative, much smaller Presbyterian Church in America – as well as other, even smaller ones. Presbyterian churches are led by a group of elders, a form of church governance known as Presbyterianism. All Presbyterian clergy may be described as ministers. Use the Rev. before a cleric’s name on first reference. On second reference use only the last name.