Among the fascinating things that are going on today are the reemergence from the margins of Christendom of the Celtic and the Anabaptist Christian traditions. There are many differences between these traditions. The Celtic tradition is very old; it emerged in the sixth century in the Christianization of Wales, Ireland, Scotland and Northumbria; it is a tradition associated with the evangelization of the Celtic peoples and the development of Christendom among them. The Anabaptist tradition, by contrast, is younger – it is only 475 years old; it sprang up in the 1520s in three areas of central Europe, and spread out across Europe and around the world from there. It was a protest against the coercive, compulsory Christianity of Christendom, and indeed has been the progenitor of the free church traditions. As such, it has functioned as one of the solvents of Christendom.