Myths of the Norsemen: From the Eddas and Sagas

It is related that Frodi once received from Hengi-kiaptr a pair of magic millstones, called Grotti, which were so ponderous that none of his servants nor even his strongest warriors could turn them. The king was aware that the mill was enchanted and would grind anything he wished, so he was very anxious indeed to set it to work, and, during a visit to Sweden, he saw and purchased as slaves the two giantesses Menia and Fenia, whose powerful muscles and frames had attracted his attention.

On his return home, Peace Frodi led his new servants to the mill, and bade them turn the grindstones and grind out gold, peace, and prosperity, and they immediately fulfilled his wishes. Cheerfully the women worked on, hour after hour, until the king’s coffers were overflowing with gold, and prosperity and peace were rife throughout his land.

But when Menia and Fenia would fain have rested awhile, the king, whose greed had been excited, bade them work on. In spite of their entreaties he forced them to labour hour after hour, allowing them only as much time to rest as was required for the singing of a verse in a song, until exasperated by his cruelty, the giantesses resolved at length to have revenge. One night while Frodi slept they changed their song, and, instead of prosperity and peace, they grimly began to grind an armed host, whereby they induced the Viking Mysinger to land with a large body of troops. While the spell was working the Danes continued in slumber, and thus they were completely surprised by the Viking host, who slew them all.

Mysinger took the magic millstones Grotti and the two slaves and put them on board his vessel, bidding the women grind salt, which was a very valuable staple of commerce at that time. The women obeyed, and their millstones went round, grinding salt in abundance; but the Viking, as cruel as Frodi, would give the poor women no rest, wherefore a heavy punishment overtook him and his followers. Such an immense quantity of salt was ground by the magic millstones that in the end its weight sunk the ship and all on board.

The ponderous stones sank into the sea in the Pentland Firth, or off the north-western coast of Norway, making a deep round hole, and the waters, rushing into the vortex and gurgling in the holes in the centre of the stones, produced the great whirlpool which is known as the Maelstrom. As for the salt it soon melted; but such was the immense quantity ground by the giantesses that it permeated all the waters of the sea, which have ever since been very salt.