[1] [2] Thorfinn was born in Trøndelag, possibly in Trondheim, Norway, and may have been a Cistercian monk before becoming Bishop of Hamar.
[3] Thorfinn and many other bishops of the area disagreed with the sitting King Eric II of Norway regarding a number of issues, including episcopal elections.
[7] Walter de Muda, one of the monks at Ter Doest at the time, wrote a poem in Latin praising the character of Thorfinn.
Father Walter remembered Bishop Thorfinn staying in the monastery and the impression he had made of gentle goodness combined with strength.
There he is depicted as the kindly and compassionate Bishop of Hamar, who makes great efforts to help the book's young lovers, denied the right to marry by malicious relatives.