Royal Library, Warsaw

[1] The establishment of the library at the palace was driven by King Stanislaus Augustus's commitment to supporting Polish intellectuals and fostering workshops for scientists to develop political and economic reforms.

Key suppliers included Warsaw booksellers such as Piotr Dufour, Jan August Poser, Józef Lex, Michał Groell, and the Kornów company from Wrocław, along with international sources like the Paris warehouse of Saint Len and Jan Franciszek Sellon, and selected British booksellers.

The Philosophy department featured works by ancient philosophers like Socrates, Plato, Seneca, and Lucretius; modern thinkers such as Erasmus, Francis Bacon, Michael Montaigne; mathematicians like Blaise Pascal, and Descartes; and French Enlightenment philosophers and Encyclopedists including Jean le Rond d'Alembert, Voltaire, and Jean-Jacques Rousseau.

The Fiction department included classics such as Homer's Iliad and Odyssey, Comedies of Aristophanes, Ovid's Metamorphoses, Lodovico Ariosto's Mad Orlando, Le Cid by Pierre Corneille, Don Quixote by Miguel de Cervantes, Robinson Crusoe by Daniel Defoe, and the Complete Works of William Shakespeare, in 10 volumes; along with the Collected works of Nicholas Boileau, in 5 volumes.

It is the only structure in the complex that survived the war with its original architectural decorations from the era of King Stanisław August intact.