In Norse mythology, Barnstokkr (Old Norse, literally "child-trunk") is a tree that stands in the center of King Völsung's hall. Barnstokkr is attested in chapters 2 and 3 of the Völsunga saga, written in the 13th century from earlier tradition, partially based on events from the 5th century and the 6th century, where, during a banquet, a one-eyed stranger appears and thrusts a sword into the tree which only Sigmund is able to pull free. Scholarly theories have been put forth about the implications of Barnstokkr and its relation to other trees in Germanic paganism.
Barnstokkr is introduced in chapter 2 of Völsunga saga where King Völsung is described as having "had an excellent palace built in this fashion: a huge tree stood with its trunk in the hall and its branches, with fair blossoms, stretched out through the roof. They called the tree Barnstokk[r]".
In chapter 3, King Völsung is holding a marriage feast for his daughter Signy and King Siggeir at King Völsung's hall. At the hall, large fires are kindled in long hearths running the length of the hall, while in the middle of the hall stands the great tree Barnstokkr. That evening, while those attending the feast are sitting by the flaming hearths, they are visited by a one-eyed, very tall man whom they do not recognize. The stranger is wearing a hooded, mottled cape, linen breeches tied around his legs, and is barefooted. Sword in hand, the man walks towards Barnstokkr and his hood hangs low over his head, gray with age. The man brandishes the sword and thrusts it into the trunk of the tree, and the blade sinks to its hilt. Words of welcome fail the crowd.
The tall stranger says that he who draws the sword from the trunk shall receive it as a gift, and he who is able to pull free the sword shall never carry a better sword than it. The old man leaves the hall, and nobody knows who he was, or where he went. Everyone stands, trying their hand at pulling free the sword from the trunk of Barnstokkr. The noblest attempt to pull free the sword first followed by those ranked after them. Sigmund, son of King Völsung, takes his turn, and—as if the sword had lay loose for him—he draws it from the trunk. The saga then continues.
Hilda Ellis Davidson draws links to the sword placed in Barnstokkr to marriage oaths performed with a sword in pre-Christian Germanic societies, noting a potential connection between the carrying of the sword by a young man before the bride at a wedding as a phallic symbol, indicating an association with fertility. Davidson cites records of wedding ceremonies and games in rural districts in Sweden involving trees or "stocks" as late as the 17th century, and cites a custom in Norway "surviving into recent times" for "the bridegroom to plunge his sword into the roof beam, to test the 'luck' of the marriage by the depth of the scar he made".