At a very early date there were a number of other printers settled at Cologne, all using types which, though easily distinguishable, are similar in appearance and of the same family; and their books have generally been ascribed to Zel. To many of them it is impossible to put a printer’s name; and certain of them have been divided into groups known by the title of the commonest book in that group which has no edition in another group. For instance, we have a certain number of books printed by the printer of the _Historia Sancti Albani_; another printer is known as the printer of _Dictys_ (perhaps Arnold ther Hoernen); another as the printer of _Augustinus de Fide_ (perhaps Goiswin Gops), and so on. No doubt, in time, when the Cologne press has been more carefully studied, the identity of some of these printers will be discovered; but at present there are a great many difficulties waiting to be cleared away. Arnold ther Hoernen, who began to print in or before 1470, was the pioneer of several improvements. The _Sermo ad populum_, printed in 1470, has a title-page, and the leaves numbered in the centre of the right-hand margin; very soon after he printed a book with headlines. He printed ‘infra sedecim domos,’ and used a small neat device, of which there are two varieties, always confused. John Koelhoff, a native of Lubeck, printed at Cologne from 1472 (?) to 1493, when he died. If the date of 1472 in his _Expositio Decalogi_ of Nider be correct, he was the first printer who used ordinary printed signatures; but the date of the book is questioned. The shapes of the capital letters in Koelhoff’s types are very distinctive; and it is curious to notice that a fount unmistakably copied from them was used by a Venetian printer named John de Colonia. Nicholas Gotz of Sletzstat, who began printing about 1470, though we find no dated book of his before 1474, and who finished in 1480, used a device engraved upon copper in the ‘manière criblée,’ or dotted style. It consists of a coat-of-arms surmounted by a helmet and crest, with his motto, ‘Sola spes mea inte virginis gratia.’ In some books we find the motto printed in a different form—‘Spes mea sola in virginis gratia.’ In 1475 was issued the _Sermo de presentacione beatissime virginis Marie_, the only book known containing the name of Goiswinus Gops de Euskyrchen. In 1476, Peter Bergman de Olpe and Conrad Winters de Homborch began to print, and were followed in 1477 by Guldenschaff, and in 1479 by Henry Quentell, the last named being the most important printer at Cologne during the latter years of the fifteenth century.