Lewis & Short

Martĭgĕna, ae, comm. [Mars-gigno], Mars-born, begotten by Mars (poet.): MartigenaeRomulus Iliades, Iliadesque Remus, Ov. Am. 3, 4, 39: Martigena Quirinus, id. F. 1, 199: vulgus, i. e. martial, Sil 16, 533.