The extensive and most valuable collection of engraved portraits, the most illustrious and other eminent British characters that figure in the history and biography, from the time of Egbert the Great, in the Eighth century, and progressively in continuation to the termination of the Eighteenth ... a number of interesting works, copiously illustrated with drawings and prints by the late possessor; grand galleries of art, and other books of prints, in portraits, history, topography, gems, including a complete series of the Marlborough Gems, in two folio vols.; antiquities of Great Britain and other European states; numerous manuscripts and books applying to the Fine Arts. &c. &c., as originally collected by Horace Walpole, Earl of Orford