The valley has been named after Dale-Gudbrand. He lived at Hundorp, which had long been the seat of power of the area. Dale-Gudbrand was the political leader of the valley until 1021. That was the year when king Olav Haraldsson (later Saint Olav) met Dale-Gudbrand and introduced Christianity to the region. Hundorp is an important historical site, which several large burial mounds and monumental stones.
The place of worship before the arrival of Christianity was located at Hove, a neighbouring farm to Hundorp. It is belived that the first church of the area was erected at Hove. After the introduction of Christianity Tord Guttormsson Istermage ("Pot belly") of Steig assumed leadership in the valley after Dale-Gudbrand. Thus the seat of power was transferred to Steig, about 1 km up the hillside from Hundorp.
Tord married Olav Haraldsson´s aunt and became a close friend of the king. His son, Steiga-Tore, played an active part in national politics and became one of the most influential men of the country. There was once a church at Steig, and there are still burial mounds here. No other community in the valley has as many burial mounds as Sør-Fron. One of the largest archaeological finds in Oppland has been made at Kjorstad, about 5 km northwest of Hundorp.