Modern investigation at best has done little to clear up the difficulties connected with the geographical history of the Apostle Peter. That he was at Rome, and suffered martyrdom in that city, is the general belief of the fathers. And it was not until the dawn of the Reformation that the apostle’s journey to that city, and his martyrdom there, became even a subject of doubt. So great was the anxiety of some to disprove the Primacy of the Roman See that scholarly men lent themselves to the repetition of myths and traditions which had no foundation in fact, and later writers, biased by early education and ecclesiastical connection, have even introduced into historical literature mythical stories, the germs of which run through the popular mythology of ancient and modern times. If, they argue, it can be proved that S. Peter was never at Rome, then we at once overturn the pretensions of the Papacy; or, again, if we can demonstrate that there is a break in the chain of succession of its bishops from S. Peter, the belief in the doctrine of an apostolic succession is clearly disproved, and the idea of a line of bishops reaching back through the long period of the _Mores Catholici_, or _Ages of Faith_, only a senseless forgery which originated with some monk the abbot of whose monastery was perhaps the first to give it form after he had ascended the chair of Peter. Mosheim, a respectable writer in the Protestant world, blinded by a singular prejudice which led him at times to forget the critical duties of the historian, is one among the few German scholars who has tarnished the pages of his _Ecclesiastical History_ by giving credence to the fabulous story of Pope Joan. “Between Leo IV., who died 855, and Benedict III.,” says he, “a woman who concealed her sex and assumed the name of John, it is said, opened her way to the pontifical throne by her learning and genius, and governed the church for a time. She is commonly called the Papess Joan. During five subsequent centuries the witnesses to this extraordinary event are without number; _nor did any one prior to the Reformation by Luther regard the thing as either incredible or disgraceful to the church_.” The earliest writer from whom any information relating to the fable of Pope Joan is derived is Marianus Scotus, a monk of S. Martin of Cologne, who died A.D. 1086. He left a chronicle which has received many additions by later writers, and among those interpolations the students of mythical lore regard the passage which refers to this story. Platina, who wrote the _Lives of the Popes_ anterior to the time of Martin Luther, relates the legend, and, with more of the critical acumen than Mosheim, adds: “These things which I relate are popular reports, but derived from uncertain and obscure authors, which I have therefore inserted briefly and baldly, lest I should seem to omit obstinately and pertinaciously what most people assert.” The legend of Pope Joan has been