The next great _capo maestro_ after Talenti was Ambrogio of Lenzo or Lanzo, near Como, one of the Campione school. His name is given in a deed of February 3, 1363, as "Ambroxius filius magistri Guglielmi de Champiglione." It is remarkable that an ancestor and namesake of this "Ambroxius" was also written down as "filius Magistri Guglielmi" in 1130, two centuries earlier, when they were leading members of the Campione school at Modena, and sculptured the façades of Modena and Ferrara cathedrals; so our Ambrogio of Florence was one of the distinguished aristocracy of the lodge, his family dating from its cradle in Lombardy. From the deed which we quote we find that Ambrogio graduated under his father, and made his first contract with Barna Batis, then _Provveditore_ of the _Opera_ of the Duomo, to provide and prepare the black marble necessary to the work, for every _braccio_ of which he was to be paid six soldi eight denari. This is the original-- "_Archivio dell' Opera dell Duomo_, February 3, 1362.--Ambroxius filius magistri Guglielmi de Champiglione, comitatus Mediolani, emancipatus a Domino magistro Guillielmo patre suo, ut continere dixit publice manu ser Joannis Arriglionis notarii de Champiglione, conduxit a Barna olim Batis provisore Operis Sancte Reparate de Florentia, locante vice et nomine operariorum ... ad faciendum et digrossandum totum marmum nigrum quod erit necessarium dicto operi, hinc ad unum annum proxime venturum, illarum mensurarum prout dicetur eidem per capomagistros dicti operis. Et dictus Barna locavit eidem die dictum marmum ad fovendum et digrossandum, et promisit pro dicto opere eidem Ambroxio de quolibet brachio dicti marmi dare eidem Ambroxio soldos sex et denarios octo f. p., etc. Que omnia, etc." Ambrogio or Ambrose remained many years in Florence. His name often appears in council. In 1356 he was elected head architect of the Duomo, and also of the restorations at the Baptistery. On April 4, 1384, when as an old man he attended a meeting to decide whether the pilasters of the tribune were strong enough to support the dome, his name is given as Ambrogio de Renzo. A marked instance of the effect of twenty years among Florentine dialect, which has an inveterate habit of mixing up l's and r's. His son, Giovanni d'Ambrogio di Lenzo, who afterwards became _capo maestro_, was also in council, and Orcagna was chosen umpire. But between the reign of Ambrogio and that of his son we have various changes in the directorship. In 1381, Giovanni, son of Stefano, called Guazetta, became _capo maestro_ together with Giovanni Fetti, who was also of the guild, and preparing first in Siena, and next at Florence, for his future work in Lucca and Bologna. Giovanni Fetti designed and made the fine "window towards the houses of the Cornacchini, under the third arch of the nave."