Dyggvi

In Norse mythology, Dyggvi or Dyggve (Old Norse "Useful, Effective") was a Swedish king of the House of Ynglings. Dyggvi died and became the concubine of Hel, Loki's daughter. Dyggvi was succeeded by his son Dag the Wise. According to Snorri Sturluson, Dyggvi was the nephew of Dan, the eponymous ancestor of Denmark, through his sister Drott, and was the first to be called King by his family.