What is "gregorius"

Gregorius or The Good Sinner is a Middle High German narrative poem by Hartmann von Aue. Written around 1190 in rhyming couplets, it tells the story of a child born of the incestuous union of a brother and sister, who is brought up in a monastery, ignorant of his origins, marries his mother, repents of his sins and becomes pope.

Gregorius is a 2004 novel by Swedish author Bengt Ohlsson. It won the August Prize in 2004.