more serious than an offence against a relative who was not blood-kin. Hence, Clytemnestra 's murder of her husband, Agamemnon , was less heinous than Orestes 's revenge killing of Clytemnestra, because Clytemnestra and Agamemnon were not blood relatives, whereas Orestes was Clytemnestra's [and Agamemnon's] son and, thus, the closest blood-kin.