Höllenfahrt Christi
The Harrowing of Hell is a non-canonical myth extrapolated from the atonement doctrine. According to this story, Christ descended into the land of the dead after his crucifixion, rescuing the righteous souls that had been cut off from heaven due to the taint of original sin. The story of the harrowing was popular during the Middle Ages. An Old English poem called "The Harrowing of Hell" describes Christ breaking into Hell and rescuing the Old Testament patriarchs. (The Harrowing is not the only explanation that Christians have put forth for the fate of the righteous who died before Christ accomplished the atonement)