Roman/Sabine demigod, son of Mars; founder of Cures, the principal Sabine city before Rome's rise. Conceived when a divine apparition (identified as Mars) impregnated a Sabine girl at the temple of Quirinus — the conception parallels the Mars-conception-of-Romulus-and-Remus pattern, with Modius Fabidius as the prior-generation Sabine version of the same Marsian-paternity foundational topos. Dionysius of Halicarnassus 2.48 records the founding tradition: Modius Fabidius gathered companions and led them to a tableland of the upper Tiber region, founded the city Cures, named after the Sabine word for "spear" (curis) — the spear being the weapon-attribute of his father Mars. Cures became the home of Numa Pompilius (Rome's second king, who brought Sabine religious traditions to Rome) and Titus Tatius (the Sabine co-king with Romulus after the Sabine War and the Rape of the Sabine Women). The Sabine-Latin synthesis at Rome's founding is structurally tied to Modius Fabidius's prior foundation of Cures — the term Quirites ("men of Cures") for the Roman citizen-body preserves the Sabine-eponymous etymological link between Cures and Rome (along with the parallel etymology from Quirinus, the deified Romulus). Together with Caeculus of Praeneste, Modius Fabidius represents the pre-Romulan generation of Italic founder-demigods: Caeculus the Vulcan-son founder of Praeneste, Modius Fabidius the Mars-son founder of Cures, both prefiguring the Mars-son founder Romulus of Rome itself.