Ingjald
Ingjald illråde or Ingjaldr hinn illráði (Ingold Ill-ruler or Ill-ready) was a legendary Swedish king of the House of Ynglings. Ingjald may have ruled in the 7th century, and he was the son of the former king Anund.
Ingjald is mentioned in the Ynglinga saga, Historia Norvegiæ, Hervarar saga, Upplendinga Konungum, Þorsteins saga Víkingssonar and Íslendingabók.
Ynglinga saga
Snorri Sturluson gave an extensive account on the life of Ingjald in the Ynglinga saga which is part of the Heimskringla.
Youth
The Ynglinga saga, a part of the Heimskringla relates that the viceroy of Fjädrundaland was named Ingvar and he had two sons, Alf and Agnar, who were of the same age as Ingjald. Svipdag the Blind was the viceroy of Tiundaland, the province of Uppsala where the Tings and the Yule (Midwinter) sacrifices were held (see the Temple at Uppsala).
One Midwinter, when Ingjald and Alf were six years old, many people had assembled at Uppsala for the sacrifices. Alf and Ingjald played, but Ingjald found that he was the weaker boy and became so angry that he almost started to cry (which was strange because people named Ingjald were known to be stronger than average). His foster-brother Gautvid led him to his foster-father Svipdag the Blind and told Svipdag about Ingjald's lack of manliness and strength. Svipdag said that it was a shame and the next day he gave Ingjald a roasted wolf's heart to eat. From that day, Ingjald became a very ferocious person and had a bad disposition and breath.