Richard Claverhouse Jebb,
The Cambridge Modern History, Volume 1…
(1902)
“ But his successor, Nicholas V (1447-55) , has the best claim to be called the founder of the Vatican Library. As Tommaso Parentucelli, he had catalogued the Library of San Marco at Florence for Cosmo de' Medici. He was thus well qualified to build up a great collection for the Vatican. During the eight years of his pontificate, he enlarged that collection with energy and judgment, adding to it several thousands of manuscripts. The number of Latin manuscripts alone was, at his death, 824, as is shown by a catalogue dated April 16, 1455. ”
