Ingvar or Yngvar (Old Norse: Yngvarr [ˈyŋɡwɑrː], d. early 7th century) was the son of Östen and reclaimed the Swedish throne for the House of Yngling after the Swedes had rebelled against Sölve.

Although the account of Ingvar is semi-legendary, the discovery of two boat grave sites in Salme, modern Estonia has confirmed that a similar historic event took place in the 8th century.

Snorri Sturluson relates in his Ynglinga saga that King Ingvar, Östen's son, was a great warrior who often spent time patrolling the shores of his kingdom fighting Danes and Estonian vikings (Víkingr frá Esthland).

[citation needed] He consequently started pillaging in Estonia in retribution, and one summer he arrived at a place called Stein (see also Sveigder).

Ingvar was buried in a mound at a place called Stone or Hill fort (at Steini) on the shores of Estonia (Aðalsýsla).

[citation needed] Snorri then quotes a stanza from Þjóðólfr of Hvinir's Ynglingatal: Þat stǫkk upp, at Yngvari Sýslu kind of sóit hafði.

The Salme event took place 50–100 years earlier than the infamous Lindisfarne Viking raid in England in the summer of AD 793.

It is likely that the human remains in it belonged to individuals of noble birth, as evidenced by the large number of expensive bronze sword-hilts and the complete lack of weaponry associated with commoners.

[10] Peets suggests that the men may have come on a voyage from Sweden to forge an alliance or establish kinship ties when unknown parties set upon them.