Saturn Devouring His Son is a painting by Spanish artist Francisco Goya. It is traditionally considered a depiction of the Greek myth of the Titan Cronus, whom the Romans called Saturn, eating one of his children out of fear of a prophecy by Gaea that one of his children would overthrow him.
The work is one of the 14 so-called Black Paintings that Goya painted directly on the walls of his house sometime between 1820 and 1823. It was transferred to canvas after Goya's death and is now in the Museo del Prado in Madrid.
Yea. And you could (still can?) get in for free, during the "happy hours". Worth visit while in Madrid.