Dyggvi
Dyggvi was a semi-legendary Swedish king of the House of Yngling, mentioned in several Old Norse sources. He is primarily known from the Ynglingatal, Historia Norwegiæ, and the Ynglinga saga within Snorri Sturluson's Heimskringla.
According to these sources, Dyggvi was the son of Dómarr and Drott, the daughter of King Danp of Denmark. Dyggvi is credited with being the first of his line to be called "king" rather than "chieftain" ( dróttinn), a distinction that suggests a shift in power or status. The Ynglingatal states he died a bed-death, suggesting a peaceful and natural demise, which contrasts with the often violent ends of other early Yngling kings.
While the accounts of Dyggvi are relatively brief, they are significant for marking a purported point of transition in the Yngling dynasty and for providing a connection to Danish royalty. The historical accuracy of Dyggvi and the details surrounding his reign are difficult to ascertain, and he is often considered a figure of Norse mythology or legend rather than a historically verifiable monarch. The accounts primarily serve to establish a lineage and a foundation myth for the Swedish kingdom.