An unofficial teaching, related to thoughts on Catholic theology, Limbo (Latin , 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,Purgatory, Limbo of the Fathers or Patriarchs, and Limbo of the Infants. However, Limbo of the Infants is not an official doctrine of the Catholic Church. Also, Purgatory is better classified as part of heaven, as official Church doctrine states that all souls in the state of purgation or cleansing (often referred to as "in Purgatory") are to be fully welcomed into eternal life after becoming fully purified.
The "Limbo of the Patriarchs" or "Limbo of the Fathers" (Latin limbus patrum) is seen as the temporary state of those who, despite the sins they may have committed, died in the friendship of God but could not enter Heaven until redemption by Jesus Christ made it possible. The term "Limbo of the Fathers" was a medieval name for the part of the underworld (Hades) where the patriarchs of the Old Testament were believed to be kept until Christ's soul descended into it by his death through crucifixion and freed them (see Harrowing of Hell). The Catechism of the Catholic Church describes Christ's descent into hell as meaning primarily that "the crucified one sojourned in the realm of the dead prior to his resurrection. This was the first meaning given in the apostolic preaching to Christ's descent into hell: that Jesus, like all men, experienced death and in his soul joined the others in the realm of the dead." It adds: "But he descended there as Saviour, proclaiming the Good News to the spirits imprisoned there." It does not use the word "Limbo".