Jón Hnefill Aðalsteinsson (29 March 1927 – 2 March 2010) was an Icelandic folklorist, philologist, and theologian. He was the first professor of folklore at the University of Iceland and published extensively, particularly on Old Norse religion. Early life and education Jón Hnefill was born in Hrafnkelsdalur in East Iceland, where his father farmed; in 2000 he published a book arguing that Hrafnkels saga Freysgoða, which takes place in the valley, contains more historical truth about heathen religious practice derived from oral tradition than has been generally thought since Sigurður Nordal's 1940 book Hrafnkatla. He was the eldest son in a family of ten children and one foster child; his brother Stefán became a geneticist in Oslo and his youngest brother Ragnar Ingi, a writer and academic in Icelandic literature. After finishing school at Menntaskólinn á Akureyri in 1948, he earned a bachelor's degree in religious history, religious psychology, and philosophy in 1958 from Stockholm University, a Cand. Theol. in theology in 1960 from the University of Iceland, and a Ph. Lic. in 1966 and PhD in 1979 in folklore from the University of Uppsala, where he studied under Dag Strömbäck. Career In 1960, Jón Hnefill was ordained, and he served as a priest in Eskifjörður for the next four years. He also worked as a journalist for the newspaper Morgunblaðið and taught at a variety of Icelandic schools and institutions of higher education, including in the divisions of philosophy, social science, and theology at the University of Iceland and from 1969 to 1988 at Menntaskólinn við Hamrahlíð. In 1983–84 he was an Honorary Research Fellow at University College London. In 1988 he became the first docent in folklore at the University of Iceland, and in 1992 the first professor. He was a full member of the Folklore Fellows. In 1998 he was the recipient of a festschrift, titled Þjóðlíf og Þjóðtrú. His scholarly work focussed on the area of Old Norse religion, particularly in Iceland, drawing on both philology and folkloristics. His PhD thesis, published in English as Under the Cloak, concerned the role of shamanic trance in the decision taken in 2000 that Iceland would convert to Christianity, and a number of his articles on Old Norse religion were collected in English translation as A Piece of Horse Liver. During his lifetime he served as chairman of the Icelandic Folklore Association, the Icelandic Historical Association, and the Icelandic