To Florence, which stood at the front of the intellectual development of Italy, belongs the credit of instituting the largest and most important of the earlier public libraries of Italy. Niccolo Niccoli, one of the most energetic of the scholarly book collectors, specified in his will, made in 1430, that his manuscripts should be placed in the Camal-dulensian monastery of S. Maria, where his friend Traversari was prior, and that these manuscripts were to be available for public use. In 1437, however, the day before his death, he added a codicil to his will, under which the decision as to the abiding-place for his manuscripts was left to sixteen trustees. He died in debt, however, and the books would have been seized by his creditors if they had not been redeemed by Cosimo de’ Medici. Cosimo placed them in the Dominican monastery of S. Mark, the collection in which, in 1444, comprised four hundred Latin and Greek manuscripts. Cosimo gave much care to the further development of this collection. As has already been mentioned, he used for the purpose the services of the great manuscript dealer, Vespasiano. After the earthquake of 1453, he caused the library building to be restored with greater magnificence than before. The care of the library was continued, after the death of Cosimo, by his son Pietro, and the collection finally became the foundation of the famous Laurentian library, which is in existence to-day. Pietro took pains to send the Greek grammarian, Laskaris, twice to the Orient to collect further manuscripts. From his first journey, Laskaris brought back no less than two hundred works, of which eighty had not heretofore been known in Italy. On his second journey, Laskaris died. The library suffered much during the invasion of Charles VIII., but a large proportion of the books were redeemed from the French invaders by the Dominican monks, who paid for them three thousand gulden. Cardinal Giovanni de’ Medici (later Pope Leo X.) took the collection from the monastery with him to Rome, but it was afterwards returned to Florence by Pope Clemens VII. Clemens gave to Michel Angelo the commission to build a hall for the library, but both Pope and architect died before the work was completed, and the building took shape only finally in 1571, the plan of Michel Angelo having been carried out in substance. The library of the Vatican passed through various vicissitudes according to the interest or the lack of interest of the successive popes, but under Pope Nicholas V. (1447-1455) it became one of the most important collections in the world for the use of scholars. In 1471, Sixtus IV. completed the library building and the rooms for the archives and added many works, and it was under this Pope that the use of the books was thrown open (under certain conditions) to the general public.