Fratricide (, from the Latin words frater "brother" and the assimilated root of caedere "to kill, to cut down") is the act of killing one's own brother. It can either be done directly or via the use of either a hired or an indoctrinated intermediary (an assassin). The victim need not be the perpetrator's biological brother. In a military context, fratricide refers to a service member killing a comrade. The term is often used metaphorically to refer to civil wars. The Abrahamic religions recognize the biblical account of Cain and Abel as the first fratricidal murder to be committed. In the mythology of ancient Rome, the city is founded as the result of a fratricide, with the twins Romulus and Remus quarreling over who has the favour of the gods and over each other's plans to build Rome, with Romulus becoming Rome's first king and namesake after killing his brother. Osiris myth In ancient Egyptian mythology, the god Osiris is murdered by his brother Set who usurps the throne. In the Hindu epic Mahābhārata, Karna was killed by Arjuna who was unaware that Karna was his eldest brother. However, the context of the crime becomes markedly different when seen from the following angle: