Roman war-god, but the registry treats Mars as substantively distinct from Greek Ares despite ancient identification. Pre-urban agricultural protector (Cato 141, Carmen Arvale) carrying war-functions; central to Roman civic religion through the Salii, the ancilia, the March/October ritual frame; begetter of Romulus and Remus on Rhea Silvia (Liv. 1.4); honored where Ares was hated. The Italic features (woodpecker, ancilia, horse-tail to the Regia) have no Greek equivalent. Per Beard/North/Price, Religions of Rome (1998); Wissowa, Religion und Kultus der Römer (1912); Dumézil, Archaic Roman Religion (1970); Scheid, Introduction to Roman Religion (2003).
Ov. Fast. 5.229-260 (Mars born of Juno alone via the flower of Olenus, without Jupiter); Hes. Theog. 921-922 cited via interpretatio as son of Iuppiter and Iuno