Although the Middle Ages usually drew upon Classic tradition in the formation of their fable literature, they at times created new themes whose popularity equalled that of many older rivals. Of no small importance among such stories are those that deal with the false peace declared by a fox in order to deceive a seemingly simple-minded bird. The numerous versions of this fable that have come down to us since the middle of the eleventh century evidence strong interrelation, in spite of individual differences of character, scene, or action. The various forms become so well established by the beginning of the sixteenth century that a history of the fable is sufficiently complete if it comes down to the end of the Middle Ages. It is the object of this article to show what versions of the Peace-Fable existed before the sixteenth century, whence they arose, and what are their relations to one another. The following is a list of the mediaeval versions:—