in Sigurðarkviða hin skamma (stanzas 20–23), and in the Völsunga saga (as well as being mentioned in the eddic poems Grípisspá and Guðrúnarkviða II). According to the eddic poem Hyndluljóð, stanza 27: Gunnar and Högni, the heirs of Gjúki, And Gudrún as well, who their sister was; But Gotthorm was not of Gjúki's race, Although the brother of both he was: And all are thy kinsmen, Óttar, thou fool! If Gotthorm or Gutthorm, the slayer of Sigurd in northern tradition, is brother of Gunnar and Högni, but is not a son of Gjúki, he must be a maternal half-brother, just as Hagen, the slayer of Siegfried in the German tradition, is a maternal half-brother in the Thidreks saga. Gudrún bore to Sigurd a son named Sigmund according to the Völsunga saga, presumably the same as the unnamed son mentioned in stanza 5 of Sigurdarkvida hin skamma. But nothing more is said of him. More often mentioned is Gudrún's daughter named Svanhild (Svanhildr) who became the wife of Jörmunrek (Jǫrmunrekr). By her third husband Jónakr, Gudrún is mother of Hamdir (Hamðir) and Sörli (Sǫrli). In the eddic poems Guðrúnarhvöt and Hamðismál, Erp (Erpr), a third son of Jónakr, was born by a different mother. But in the Skáldskaparmál and the Völsunga saga Erp is also a son of Gudrún. In the Atlakviða (stanza 12), a son of Högni says farewell to his father as Gunnar and Högni depart to visit Atli. The Atlamál (stanza 28) brings in two sons of Högni by his wife Kostbera, named Snævar (Snævarr) and Sólar (Sólarr). They accompany their father and uncle on their fateful journey to Atli's court where they also meet their deaths. These sons are also mentioned in the prose introduction to the eddic poem Dráp Niflunga along with a third son Gjúki. The Atlamál later introduces another son of Högni (or possibly Gjúki son of Högni under another name) who, along with Gudrún, kills Atli. In the Völsunga saga this son is named Niflung (Niflungr). He may be a reflex of the posthumous son of Högni who is called Aldrian in the Thidreks saga. The Danish Hven Chronicle also tells the story of Högni's posthumous son begotten as Högni is dying, of the switching of children so that Högni is brought up as son of Atli and "Gremhild", and of how this son lures Gremhild to the cave of treasure and seals