<human>:  When was the sarcophagus invented?
<bot>: The sarcophagus was invented in Ancient Egypt, around 3100 BC. The sarcophagus is a coffin that is made of stone, which is usually carved with images of the deceased. The coffin was used for the burial of the deceased, and the stone was also used for construction. The sarcophagus was invented in Ancient Egypt, but the modern version was created in the 18th century.