Dygvi, Dyggve or Digne was according to Ynglingatal a Swedish king of the House of Ynglings. He died in bed and never reached Valhalla. Instead he went to Hel, Loki's daughter, who acquired a husband of royal blood. In Ynglinga saga, Snorri Sturluson included a piece from Ynglingatal composed in the 9th century:
Kveðkat dul,
nema Dyggva hrör
Glitnis gná
at gamni hefr,
því at jódis
Ulfs ok Narfa
Konungmann
kjósa skyldi;
ok allvald
Yngva þjóðar
Loka mær
of leikinn hefr.[1] (http://www.home.no/norron-mytologi/sgndok/kvad/yngli.htm) Dygve the Brave, the mighty king,
It is no hidden secret thing,
Has gone to meet a royal mate,
Riding upon the horse of Fate.
For Loke's daughter in her house
Of Yngve's race would have a spouse;
Therefore the fell-one snatched away
Brave Dygve from the light of day.(Laing's translation [2] (http://www.sacred-texts.com/neu/heim/02ynglga.htm))
Sources
Ynglingatal
Ynglinga saga (part of the Heimskringla)
Historia Norwegiae