Detail from the 4th century porphyry sarcophagus of Constantina in the Mausoleum of Costanza, Rome. It depicts cherubs, framed by vine branches, harvesting grapes, a common theme in classical art. The purple colour of porphyry signifies that royalty is entombed within as porphyry stone was reserved by the Romans exclusively for the imperial family. This is a replica of the grand sarcophagus original which is now in the Vatican Museum.