In the theology of the Catholic Church, Limbo (Latin limbus, edge or boundary, referring to the "edge" of Hell) is a speculative idea about the afterlife condition of those who die in original sin without being assigned to the Hell of the Damned. Medieval theologians of western Europe described the underworld ("hell", "hades", "infernum") as divided into four distinct parts: Hell of the Damned (which some call Gehenna), Purgatory, Limbo of the Fathers or Patriarchs, and Limbo of the Infants. But Limbo of the Infants is not an official doctrine of the Catholic Church.