The writer of the following treatises, Jean Rodolphe Peyran, was a native of the valleys of Piedmont, where both his father and grandfather had been raised in the office of Moderator of the Waldensian Church. Like them, he served as a pastor and in the office of the moderator. This collection of his treatises, translated into English, covers Waldensian Church history, provides biographical sketches of some of the Waldensian Church’s most important leaders, connects the principles of the Waldensian Church with those of the Reformation in the sixteenth century, documents that the ancient Waldenses perpetuated an episcopal form of Church government, and more.