"1396.--The Magistri Jacopo da Campione, Giovannino de Grassi, and Marco da Carona, architects, came from Milan to inspect, order, and build in the aforenamed works" (causa videndi ordinandi et hedificandi). The two latter must have been the Duke's architects spoken of before. All through August and September Jacopo da Campione was backwards and forwards between Milan and Pavia, and Maestro Bernardo also received his salary monthly as chief architect. Again, on November 22, 1396, we read--"To Master Jacopo da Campione, architect of Milan cathedral (inzignerio ecclesiæ majoris Mediolani), for fourteen days during October and November, in which he remained working and superintending in the said _laborerium_ (Certosa) at his own expense, and in payment for some designs made by him at Milan, and submitted to the Duke's approval here." On December 4, 1396, the _Provveditore_ notes the purchase of twenty sheets of parchment, most of which were consigned to the Magistri Jacopo da Campione and Cristoforo da Lonigo for the designs of the church. From these entries, it would seem that Jacopo was the architect who drew the designs, and Bernardo da Venezia the master builder who executed them. As a farther proof, there is the deliberation of the Administration of Milan, on March 4, 1397, to which we have already referred, in which it says that Jacopo was in command of the works at Certosa (qui acceptatus est super laboreria Carthusiæ). Other Campionese names also appear in the registers; such as Domenico Bossi da Campione, who was paid "for four marble slabs, with certain inscriptions, which were placed under the foundations when the Visconti laid the first stone on August 27, 1396;" and "Giovanni da Campione, called Bosio, for three sculptured marble slabs for three reliquaries." In 1397, Gian Galeazzo, being taken up with affairs of state, ceded the presidency of the Administration of the Certosa Lodge to the Prior of the Carthusians, adding more donations and an endowment. The Prior's first actions were to dismiss Bernardo da Venezia as master builder, and to call Antonio di Marco from Crema. He was son of Marco da Campione, one of the chief architects of Milan cathedral, and brother of Guglielmo di Marco, whom we have also found at Milan in 1387, where he was called as an expert to give judgment on some moot point.