Short answers, pulled from the story.
The Bibliotheca Corviniana was a Renaissance library assembled by Matthias Corvinus, King of Hungary, inside Buda Castle. At its peak it held about 3,000 codices containing some four to five thousand works.
North of the Alps, the Bibliotheca Corviniana was the largest library in Europe. Contemporary accounts ranked it second only to the Vatican Library across all of Europe.
Following the Ottoman victory at Mohács in 1526 and the conquest of Buda, the codices were taken to Istanbul. Of the roughly 3,000 original volumes, only about 216 Corvinae are known to have survived and are now held in libraries across Hungary and Europe.
The destruction of the Bibliotheca Corviniana resulted in the loss of the complete works of the ancient orator Hypereides, writings by Flavius Cresconius Corippus, texts by Procopius, and works by the scholar Cuspinianus. Some of these volumes held the only surviving copies of those texts.
Items from the Bibliotheca Corviniana were inscribed on UNESCO's Memory of the World Register in 2005 in recognition of their historical significance.
In 1489, the Florentine scholar Bartolomeo della Fonte recorded that Lorenzo de Medici founded his own Greek-Latin library encouraged by the example of the Hungarian king and his collection.