Sidero

In Greek mythology, Sidero (Σιδηρώ, "the Iron One") was the second wife of Salmoneus and stepmother of Tyro, whom she mistreated. Pelias and Neleus, Tyro's twin sons, sought revenge when they reached adulthood. Although Sidero fled from them into Hera's district, Pelias nevertheless murdered her atop the altar to Hera.