Merzario is of opinion that such names as Marc the Frisian, who was one of the Campione school; Jacopo Tedesco, whom all old writers agree was Italian; Guglielmo d'Innspruck, also a Campionese, have been the cause of much misunderstanding, and have sent authors off on false scents. It was the custom, in the books of the Comacines, to name people from their _provenienza_, i.e. the last place they came from. Thus at Siena you will find Niccolò da Pisa, while at Pisa he is Niccolò di Apulia. Lorenzo Maitani was Lorenzo da Siena to the Orvieto people, and Lorenzo d'Orvieto to the Florentines. Marco il Frisone, born at Campione, is therefore a link between the German guilds and the Italian; he must have worked at Friesland, and probably brought back ideas of a more pointed Gothic from there. These registers are ample proof that the builders just called in for the building of Milan cathedral were of the Lombard Guild, and chiefly of the Campione branch. It is not till 1389 that we find a single German name, and then a certain "Anichino (Annex) di Germania" is paid 16 soldi for having made a model of a _tiburio_ (cupola) in lead, and Giacobino da Bruge, who falls ill while working at the church, has a slight subsidy given by the guild _per amor di Dio_. They are not mentioned again, and neither of them seem to be Masters. That Simone da Arsenigo was chief architect at this time, not a doubt can exist. It is especially emphasized in a deed executed in December 1387. In it the Administration, "in consideration of their long and continued experience of the pure and admirable goodwill, and the _opera multifaria_ which the worthy man, Magister Simone da Arsenigo, most worthy chief architect and master, has achieved in this church, by constant diligence, and wishing to remunerate him better (pro aliquali remuneratione bene meritorem), decide that whereas his salary hitherto has been ten imperial soldi a day, it shall now be raised to ten gold florins a month." It is plain, however, that he worked in concert with the guild. Just as at Florence and Siena, great councils of the Masters, both architects and sculptors, were held to consider whether the foundations were strong before continuing the building, so in Milan a great meeting was called on Friday, March 20, 1388, in which all the _Magistri_ were cited before their patrons, the Imperial Vicar-General, and the Council of XII. (In Florence the Arte della Lana took the post of President of the Works.) All the _Magistri_ were charged to give their opinion on the building in its present state, and to suggest any improvements they could. First uprose Master Marco da Campione (Surrexit primus Magister Marchus de Campilione, Inzignerius), and said there was an error in the wall on the side of Via Compedo, the wall being, in one part, "half a quarter" wider than the measure given. He suggested undoing that part to the foundation.