[1] According to Skáldskaparmál, after these objects were created Loki made a bet with a dwarf, Brokkr, that his brother Eitri (or Sindri) would not be able to craft items to match the quality of those displayed by the sons of Ivaldi.
This contest resulted in the creation of the boar of Freyr (Gullinbursti), the ring of Odin (Draupnir) and the hammer of Thor (Mjolnir), which were judged by the gods to be even more wondrous than the others.
The account of this tale given in Skáldskaparmál does not reveal the names of Ivaldi's sons, nor how many there were, and they remain conspicuously absent after their initial mention in the stanza.
The passing mention made of them in Grímnismál 43, the creators of Skidbladnir, "the best of ships", likewise sheds no additional light.
In the eddic poem Hrafnagaldur Óðins, stanza 6, Idunn is identified as an "elf" (alfar) and the "youngest of the elder children of Ivaldi".