Yngvefrey
Divine progenitor of the Yngling dynasty, worshipped and sacrificed to by the Swedes long after his time.
Yngvefrey is the divine progenitor of the Yngling dynasty, attested in the Heimskringla as the figure from whom the Swedish royal line takes its name. The Swedes "long after his time, worshipped and sacrificed to" Yngvefrey, and "the race or family of the Ynglings take their name" from him (Heimskringla, Preface Of Snorre Sturlason).
The Heimskringla's single attestation, appearing in Snorri's preface, establishes Yngvefrey's dual significance: as the object of a persistent Swedish cult and as the namesake of the Yngling dynasty. The phrasing "long after his time" implies a euhemeristic reading -- Yngvefrey is placed in historical time, not treated as an eternal deity -- while the reference to worship and sacrifice confirms his divine status in the tradition Snorri recorded (Heimskringla, Preface Of Snorre Sturlason).
On trail: Genealogies