The photograph of an ancient cylinder seal found at Lagash is reproduced and explained as a representation of the king being killed by his son while copulating with his royal wife, the son's mother, who, moreover, is probably helping in the parricidal act and will be seduced by her son as soon as it is accomplished. Reproductions of rock-drawings found as far apart as in North Europe and South Africa are then given to show the widespread extension of this Sumerian-Babylonian ritual and myth, according to which the son kills his royal father, with the assistance of his mother, becomes king in his place and makes the queen-mother his 'first wife'.