The Campione school of Masters still held its own: we now find that Matteo da Campione was sent for from Monza. Zeno da Campione, brother of the late Jacopo, also came with two hundred and fifty stone-cutters under him to carve the capitals, pinnacles, etc. etc. There was Lorenzo degli Spazi di Laino in Val d'Intelvi, also of the same school, who brought one hundred and eighty-eight stone-carvers to the _laborerium_, and who won fame for the fine sculpture they produced. Can one wonder at the wealth of sculpture in and on the cathedral, when only two _Magistri_ can furnish more than four hundred workmen between them? When one looks at the lavish marble work on the roof, the plurality of artists is well accounted for. Giovannino dei Grassi, or Gracii, seems to have succeeded Jacopo as _capo maestro_, and his designs and Jacopo's were kept with reverence in the rooms of the Administration. In 1400 Jacopo da Tradate is the "supreme sculptor" to the fabric. He did the statue of Martin V. in commemoration of that Pope's visit to Milan in 1418, after the Council of Constance, when he consecrated the principal altar. Jacobino da Tradate also sculptured the mausoleum of Pietro, son of Guido Torello, Marquis of Guastalla, in S. Eustorgio at Milan. His son, Samuele, was a friend of Andrea Mantegna's, and once visited him on the Lago di Garda. He too was a sculptor, and made his father's tomb in the cloister of S. Agnese, which he inscribed--"Jacobino de Tradate patri suaviss:--Qui tamquam Praxiteles vivos in marmore fingebat vultus--Samuel observantis. V. F." In 1402 Duke Gian Galeazzo died, and during the minority of his son, art, architecture, and sculpture languished. Few famous names are preserved, and all of those were from the neighbourhood of Como. Those mentioned in the books as continuing the work between 1402 and 1440, are Jacopo da Tradate, Bertollo da Campione, Giorgio de Sollario, sculptors, and Paolino da Montorfano, a painter. At a later period other Masters appeared, and we find Giovanni de Solari from Val d'Intelvi, Guglielmo di Giorgio and Giovanni di Reghezio, Jacopo da Lanzo, Michele di Benedetto da Campione, Francesco Solari, and Giovanni da Cairate, all sculptors, with Cristoforo da Chiona, Arasmino Solari da Arogna, Franceschino da Canobbio, Leonardo da Sirtori, Paolino da Arsenigo, and Giovanni Solari, all Lombard engineers and architects.