Knésetja (lit. "knee-setting"; German Kniesetzung) is the Old Norse expression for a custom in Germanic law, by which adoption was formally expressed by setting the fosterchild on the knees of the foster-father.
When prince Haakon, the youngest son of Harald Fairhair was brought to the court of Aethelstan, the Norwegian messenger, Haukur, simply placed the child on the king's knees as soon as he came into his presence. By this act, Haakon had been adopted by Aethelstan, which also implied an insult to the English king as the foster-father was usually of lower standing than the real father. Aethelstan became angry and wanted to kill the child on the spot, but Haukur simply said that since he was now the child's foster-father it was up to him whether he wanted to kill him and went away. Aethelstan let the child live and had him baptized. (Heimskringla, Harald Harfager's Saga).
The Germanic procedure of Kniesetzung has parallels in various other Indo-European cultures, and has been suggested to derive from a custom in Proto-Indo-European society in comparative philology since the 1920s, although evidence for this is considered inconclusive.
In Hittite texts of the Late Bronze Age, specifically the mythological texts of the Song of Ullikummi and the Story of Appu, there are accounts of the how after the birth of the son, the father accepts the newborn from the midwife and as a sign of the son's legitimacy sets him on his knee and names him.
- "Eherecht" in Johannes Hoops, Heinrich Beck (eds.), Reallexikon der germanischen Altertumskunde, vol. 6, Walter de Gruyter, 1986, ISBN 978-3-11-010468-4, p. 496.
- Güterbock, Kumarbi. Mythen vom churritischen Kronos aus den hethitischen Fragmenten zusammengestellt, übersetzt und erklärt, p. 119. Otten, Mythen vom Gotte Kumarbi, p. 15.
- Meillet, BSL 27 (1926); sceptically Thieme, KZ 66 (1939).
- Eduard Schwyzer, 'Der Götter Knie - Abrahams Schoss', FS Wackernagel (1924); Emile Benveniste, BSL 27 (1926)
- J. Loth, Revue Celtique 40 (1923)
- "Adoption" in Eduard Hoffmann-Krayer, Hanns Baechtold-Staeubli (eds.), Handwoerterbuch des Deutschen Aberglaubens, Walter de Gruyter, 1974, ISBN 978-3-11-006589-3.
- F. Roeder, Die "Schoss" odor "Kniesetzung", eine angelsächsische Verlobungszeremonie, Göttingen, 1907.