Prints copying prints were already common, and many fifteenth century prints must have been copies of paintings, but not intended to be seen as such, but as images in their own right. Mantegna's workshop produced a number of engravings copying his "Triumph of Caesar" (now Hampton Court Palace), or drawings for it, which were perhaps the first prints intended to be understood as depicting paintings—called reproductive prints. With an increasing pace of innovation in art, and of a critical interest among a non-professional public, reliable depictions of paintings filled an obvious need. In time this demand was almost to smother the old master print.