Ingjaldr

Ingjaldr was a legendary warrior who appears in early English and Norse legends. Ingeld was so well known that, in 797, Alcuin wrote a letter to Bishop Higbald of Lindisfarne questioning the monks' interest in heroic legends with: 'Quid enim Hinieldus cum Christo?' (What has Ingeld to do with Christ?)

Skjöldunga saga and Bjarkarímur
The Skjöldunga saga and Bjarkarímur reverse the relationship between Froda and Ingeld by making Ingeld (Ingjaldus) the father of Froda (Frodo). Moreover, Ingeld is here described as the half-brother of Healfdene (Haldan).

Frodo defeated the Swedish king Jorund, made him a tributary and took his daughter. The daughter gave birth to Haldan, but another woman became Frodo's legitimate wife and gave him Ingjaldus. Together with one of his earls, Swerting, Jorund conspired against Frodo and killed him during the blót.

Haldan has a queen named Sigrith with whom he has three children: the sons Roas (Hroðgar) and Helgo (Halga) and the daughter Signy. Ingjaldus is jealous with his half-brother and so he attacks and kills Haldan, whereupon he marries Sigrith. Ingjaldus and Sigrith have two sons named Rærecus and Frodo. Ingjaldus, who is worried that his nephews would want revenge, tries to find them and kill them, but Roas and Helgo survive by hiding on an island near Skåne. When they are old enough, they avenge their father by killing Ingjaldus.

In the Hrólfr Kraki's saga, which tells very much the same story, it is Froda (Fróði) who is the half brother of Halfdan.