Soon after the supposed date of the Calendar the second of the three protagonists in the development of printing at Mainz comes on the scene. This was Johann Fust, a goldsmith, who in or about August, 1450, lent Gutenberg eight hundred guilders to enable him to print books, himself, nominally or truly, borrowing the money from another capitalist, and thereby gaining the right to charge interest on it without breaking the canon law. By about December, 1452, the loan was exhausted, and Fust made a fresh advance of the same amount. The inner history of the next four years is hid from us, and the undisputed facts which belong to them have consequently been interpreted in every variety of way that human ingenuity can devise. These facts are that-- (i) Printing was continued with the fount of type used for the Calendar attributed to 1448, fragments of more than a dozen different editions of _Donatus_ printed with it being still extant, also a prognostication, _Manung widder die Durken_, printed in December, 1454, a Bull of Pope Calixtus "widder die Turcken" of 1456, a medical Calendar for 1456, and an undated _Cisianus_, another work of an astronomical character. (ii) When the pardoners employed by the proctor-general of the King of Cyprus came to Mainz in the autumn of 1454 to raise money by means of a papal Indulgence, valid till 30 April of the following year, they were able to substitute two typographically distinct editions for the manuscript copies which they had previously used, the text of each of these Indulgences being printed in a separate fount of beautifully clear small type, while a larger type was used for a few words. In one of these Indulgences the larger type belongs, with some differences, to the same fount as the books named in our last paragraph. This Indulgence has thirty-one lines, and four issues of it have been distinguished, three of them dated 1454 (the earliest of these being the earliest dated piece of printing) and the fourth 1455. In the other Indulgence there are only thirty lines, the large type is neater, and three issues have been distinguished, one dated 1454, the other two 1455. (iii) In November, 1455, an action brought by Fust to recover the 1600 guilders which he had lent Gutenberg, with the arrears of interest, reached its final stage. In this suit the third of the Mainz protagonists, Peter Schoeffer, was a witness on the side of Fust, and we hear also, as servants of Gutenberg, of Heinrich Keffer and Bertolf von Hanau, who may apparently be identified with printers who worked subsequently at Nuremberg and Basel. The document which has come down to us and is now preserved at the University Library at Gottingen is that recording the oath taken by Fust, as the successful plaintiff, in order to obtain judgment for the amount of his claim.