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The erection of the later chateau was begun by Charles, Comte de Valois, brother of Philippe-le-Bel; and it was completed by Philippe VI of Valois, and his successor, Jean-le-Bon, between the years 1337 and 1370, when it became an entirely new manner of edifice from what it had been before.
It is related that in 1373 the valet-de-chambre of Charles V made a catalogue of the nine hundred and ten volumes which formed this collection, an immense number for the time when it is known that his predecessor, Jean-le-Bon, possessed but seven volumes of history and four devotional books as his entire literary treasure.