In 1627, Cardinal Francesco Barberini, the favourite nephew of Urban VIII, attracted Lucas Holste, a peripatetic German scholar and gifted linguist, as his librarian.19 With virtually unlimited financial resources at his disposal, Holste created a library that would almost rival the first Mazarine library in size. … On one trip, the Pope issued an edict to the Neapolitan Franciscans which forbade them to sell any books from their collections unless they first offered them to Francesco Barberini and his librarian.

Andrew Pettegree, Arthur der Weduwen, The Library- A Fragile Hist…, loc. 477