Eanmund was a Swedish

Suiones

The Swedes e, "one's own [tribesmen/kinsmen]"; Old English: Sweonas; , Suehans or Sueones) were an ancient North Germanic tribe in Scandinavia...

 prince

Prince

Prince is a general term for a ruler, monarch or member of a monarch's or former monarch's family, and is a hereditary title in the nobility of some European states. The feminine equivalent is a princess...

 of the Scylfing

Yngling

The Ynglings were the oldest known Scandinavian dynasty. It can refer to the clans of the Scylfings , the semi-legendary royal Swedish clan during the Age of Migrations, with kings such as Eadgils, Onela and Ohthere...

 dynasty

Dynasty

A dynasty is a sequence of rulers considered members of the same family. Historians traditionally consider many sovereign states' history within a framework of successive dynasties, e.g., China, Ancient Egypt and the Persian Empire...

. Unlike his relatives, Eanmund is only mentioned in Beowulf

Beowulf

Beowulf , but modern scholars agree in naming it after the hero whose life is its subject." of an Old English heroic epic poem consisting of 3182 alliterative long lines, set in Scandinavia, commonly cited as one of the most important works of Anglo-Saxon literature.It survives in a single...

. Eanmund was the son of Ohthere

Ohthere

Ohthere, Ohtere , Óttarr, Óttarr vendilkráka or Ottar Vendelkråka was a semi-legendary king of Sweden who would have lived during the 6th century and belonged to the house of Scylfings...

, and was the brother of Eadgils

Eadgils

Eadgils, Adils, Aðils, Adillus, Aðísl at Uppsölum, Athisl, Athislus or Adhel was a semi-legendary king of Sweden, who is estimated to have lived during the 6th century....

. If he existed in real life, his real name was probably Proto-Norse *Aiwamunduz (Old East Norse Ēmund) or *Āmunduz (Old East Norse Āmund).

Ohthere died, and Ohthere's younger brother Onela

Onela

Onela was according to Beowulf a Swedish king, the son of Ongentheow and the brother of Ohthere. He usurped the Swedish throne, but was killed by his nephew Eadgils, who won by hiring foreign assistance....

, usurped the Swedish throne. Since their uncle had seized power, Eanmund and Eadgils sought refuge among the Geats. This caused Onela to attack the Geats, an attack which was also motivated by the fact that the Geatish king Heardred

Heardred

Heardred , d. ca 530 AD, is the son of Hygelac, king of the Geats, and his queen Hygd, in Beowulf. After Hygelac's death, in Frisia, Hygd wants to make Hygelac's nephew Beowulf, king of Geatland, as she fears that the young Heardred won't be able to defend his people...

's father had killed Onela's father Ongentheow. During the battle, Eanmund was killed by Onela's champion Weohstan

Weohstan

Weohstan, Wēohstān or Wīhstān is a legendary character who appears in the Anglo-Saxon epic poem Beowulf and scholars have pointed out that he also appears to be present in the Norse Kálfsvísa.In both Beowulf and Kálfsvísa, Weohstan fought for his king Onela...

 and Heardred was killed as well. Eadgils, however, survived and according to the poem Beowulf later helped him avenge Eanmund and Ohthere by slaying Onela, an event which also appears in Scandinavian sources.

In the tale, Weohstan took Eanmund's sword which was inherited by his son Wiglaf who used the sword when fighting the dragon

Dragon

A dragon is a legendary creature, typically with serpentine or reptilian traits, that feature in the myths of many cultures. There are two distinct cultural traditions of dragons: the European dragon, derived from European folk traditions and ultimately related to Greek and Middle Eastern...

together with Beowulf.