The Norsemen were the more prone to these superstitions, because it was a favourite fancy of theirs that, in many instances, the change from life to death altered the temper of the human spirit from benignant to malevolent; or perhaps, that when the soul left the body, its departure was occasionally supplied by a wicked demon, who took the opportunity to enter and occupy its late habitation.
Upon such a supposition the wild fiction that follows is probably grounded; which, extravagant as it is, possesses something striking to the imagination. Saxo Grammaticus tells us of the fame of two Norse princes or chiefs, who had formed what was called a brotherhood in arms, implying not only the firmest friendship and constant support during all the adventures which they should undertake in life, but binding them by a solemn compact, that after the death of either, the survivor should descend alive into the sepulchre of his brother-in-arms, and consent to be buried alongst with him. The task of fulfilling this dreadful compact fell upon Asmund, his companion, Assueit, having been slain in battle. The tomb was formed after the ancient northern custom in what was called the age of hills, that is, when it was usual to bury persons of distinguished merit or rank on some conspicuous spot, which was crowned with a mound. With this purpose a deep narrow vault was constructed, to be the apartment of the future tomb over which the sepulchral heap was to be piled. Here they deposited arms, trophies, poured forth, perhaps, the blood of victims, introduced into the tomb the war-horses of the champions, and when these rites had been duly paid, the body of Assueit was placed in the dark and narrow house, while his faithful brother-in-arms entered and sat down by the corpse, without a word or look which testified regret or unwillingness to fulfil his fearful engagement. The soldiers who had witnessed this singular interment of the dead and living, rolled a huge stone to the mouth of the tomb, and piled so much earth and stones above the spot as made a mound visible from a great distance, and then, with loud lamentation for the loss of such undaunted leaders, they dispersed themselves like a flock which has lost its shepherd.