The problem of a possible continuity of late medieval heresies and sixteenth century sects in Switzerland and Germany has not been thoroughly investigated yet. Of course some historians have touched upon the problem. Thus in 1886 Ludwig Keller advanced the thesis that Anabaptism was closely connected with the Waldensian tradition. Recently a Marxist historian, Gerhard Zschäbitz, pointed out that certain ideas of the Hussite tradition had infiltrated Anabaptism in Thuringia. On the whole, however, it is assumed that medieval heresies did not survive the fifteenth century. The sixteenth century German sects are considered a product of the Reformation. This is implying that the Reformation constituted a complete break with the past and opened an altogether new age. It hardly needs pointing out that this is a hazardous assumption. It is rather hard to believe that heresies, which had secretly lived on in certain towns and villages for one or two hundred years should suddenly have died out by 1500.