 When Cosimo de' Medici wished to assemble the Laurentian Library of Florence, Vespasiano advised him, and sent him by Tommaso Parentucelli (later Pope Nicholas V) a systematic catalogue, which became the plan of the new collection.In twenty-two months Vespasiano had 200 volumes made for Cosimo by twenty-five copyists.Most of them were, as typical of the era, books of theology and liturgical chant.