Pope Gregory VI

Pope Gregory VI (; died 1048), born Johannes Gratianus, was an Italian priest of the Roman Catholic Church and the 149th Pope from 1 May 1045 until his abdication on 20 December 1046.
Early life.
Johannes Gratianus was born in Rome, but the date of his birth is not known. 
Pope.
Gratianus became pope in 1045; and he took the name Gregory. There was a problem in the way he became pope. 
Gregory VI willingly resigned; and then he retired to a monastery.
Hildebrand was the papal chaplain. This priest stayed with the former pope until his death in Cologne.