Heremod

Heremod (Proto-Norse: *Harimōdaz [1], Latin form: Heremodius) is a legendary Danish king and a legendary king of the Angles who would have lived in the 2nd century and known through a short account of his exile in the Old English poem Beowulf and from appearances in some genealogies as the father of Scyld. He may be the same as one of the personages named Hermóðr in Old Norse sources. Heremod may also be identical to Lother (Latin Lotherus) in Saxo Grammaticus' Gesta Danorum (Book 1) or the same history may have been applied to two originally separate figures.

In Beowulf, after Beowulf has defeated Grendel, a bard sings the deeds of Sigmund:

He had of all heroes the highest renown

among races of men, this refuge-of-warriors,
for deeds of daring that decked his name
since the hand and heart of Heremod
grew slack in battle. He, swiftly banished
to join with Jutes at mercy of foes,
to death was betrayed; for torrents of sorrow
had lamed him too long; a load of care
to earls and athelings all he proved.
Oft indeed, in earlier days,
for the warrior's wayfaring wise men mourned,
who had hoped of him help from harm and bale,
and had thought their sovran's son would thrive,
follow his father, his folk protect,
the hoard and the stronghold, heroes' land,

It appears that Heremod was banished by his subjects and fled to the Jutes where he was betrayed to his death. After Beowulf has slain Grendel's dam, King Hrothgar speaks again of Heremod:

...
Wikipedia