Canopic Jars representing the Four Sons of Horus. A set of four canopic jars was an important element of the burial in most periods of Ancient Egyptian history. Canopic jars were containers in which the separately mummified organs would be placed. The best known versions of these jars have lids in the shape of the heads of protective deities called the four Sons of Horus. The human-headed Imsety was the guardian of the liver; the baboon-headed Hapy looked after the lungs; the jackal-headed Duamutef was responsible for the stomach; and the falcon-headed Qebehsenuef cared for the intestines.