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