In the art world, if an artwork exists in several versions, the one known or believed to be the earliest is called the prime version. Many artworks produced in media such as painting or carved sculpture which create unique objects are in fact repeated by their artists, often several times. It is regarded as a matter of some importance both by art historians and the art market to establish which version has "priority", that is to say was the original work. The presumption usually is that the prime version is the finest, and perhaps the most carefully done, though some later versions can be argued to improve on the originals.

The Orleans Collection was a very important collection of over 500 paintings formed by Philippe d'Orléans, Duke of Orléans, mostly acquired between about 1700 and his death in 1723. Apart from the great royal-become-national collections of Europe it is arguably the greatest private collection of Western art, especially Italian, ever assembled, and probably the most famous, helped by the fact that most of the collection has been accessible to the public since it was formed, whether in Paris, or subsequently in London, Edinburgh and elsewhere.