Old authors tell us that "the most famous Masters from foreign parts vied in lending their help to the building of such an important edifice, under the direction of Buschetto."[162] Another old MS.[163] records that the "Opera of the Duomo was instituted in 1080, some years after Buschetto was engaged, and that the first _operai_ of the Council were Hildebrand, son of the Judge Uberto, son of Leo, Signoretto Alliata, and Buschetto of Dulichium who was architect. The head of these was Hildebrand, and the others were ministers and officers of the Opera, as may be found in the archives of the said Opera."[164] Here we have the full organization of the Comacine House of Works. The dignitaries of the city as President, Treasurer, and Ministers, the head architect also a member of the Council of the Opera. Another old writer calls Buschetto _capo della scuola Pisana_. Niccolò, Giovanni, and Andrea da Pisa are fine proofs that the school at Pisa flourished and brought forth brave artists. Even as late as the sixteenth century, when Sansovino was sculpturing the casing of the Holy House at Loreto, we are told that thirty of the best carvers in stone were sent from Pisa to work under the Capo Maestro, Andrea Contucci of Monte Sansovino.[165] Among the _Magistri_ from other parts in Buschetto's time, one of the chief was doubtless Rainaldo, who, judging from the inscription near the principal door of the façade, was not only a working sculptor in the guild, but also a full-fledged Master-- HOC OPUS EXIMIUM TAM MERUM TAM PRETIOSUM: RAINALDUS PRUDENS OPERATOR, ET IPSE MAGISTER: COSTITVIT MIRE, SOLLERTER, ET INGENIOSE. It is much to be deplored that this inscription bears no date, so that we cannot tell whether Rainaldo were chief architect after Buschetto, or whether he were only sculptor and executed the front; Buschetto being architect, and designing the whole. Here we have several things to suggest both these artists as Italians, (1) Their names. (2) The Comacine form of their institutions, with the _Opera_ at the head. (3) The concourse of Italian _Magistri_ which followed them; but as usual, absolute proof is wanting.