The Percival David Foundation of Chinese Art is his collection of Chinese ceramics and related items in London. The Foundation's main purpose is to promote the study and teaching of Chinese art and culture. The Collection consists of some 1,700 pieces of Song, Yuan, Ming and Qing ceramics, mostly porcelain, from the 10th century to the 18th, "high-quality Chinese-taste Song, Ming and Qing ceramics", as the British Museum puts it. It concentrates on the ceramics made for the imperial court, and includes examples of the rare "Ru" and "Guan" wares and two important Yuan dynasty blue and white porcelain temple vases (the "David Vases") the oldest dated blue and white porcelain objects, from 1351 A.D.